No, it's not really hard to know that people who vote for a racist political party are voting for a racist platform instead of 'I'm not being listened to!'
If you would understand anything of politics, you would understand that politicians and political parties have a political program that covers a diversity of subjects. The PVV might present itself as the party against Islam, in reality they have a program that attacks everything dutch people are not happy with. I am willing to go so far that the end desire of the PVV is not the removal of Muslims from the Netherlands, instead they want to enforce a bit more integration to prevent increasing control from those extremist people who claim to have the Islamic faith. The extremist people who preach violence and are willing to use violence. This also seems from the politic behavior of the PVV. They bet high and are happy with an end result which is a lot less extreme then what they where aiming for at the start. But that is just my opinion based on what i have noticed what they have accomplished so far. Of course i could be wrong.
For example, a lot of people in the Netherlands bought a house, there is some tax reduction system that allows to receive back some payed tax with relation to the mortgage. The PVV did not want to remove this option of tax reduction that is for many people a means to save money for later. People fear that they worked their whole life only to learn that some financial manager at some pension fund gambled wrong with the pensions. The last years the mortgage crisis and the bank crisis increase these fears.
A lot of dutch people are angry with the EU that the EU enforces rules and laws but refuses to solve simples issues such as the monthly Strasbourg/Brussels exchange which cost in the order of around 10 to 15 million euro each month. The PVV wants to address these kind of situations. If they will succeed is another question but it looks great on party program papers.
When the dutch people voted against he EU constitution in 2005 EU president Barosso clearly stated that people in the EU should not be allowed to vote for these kind of democratic issues ?

Is this man insane ? A lot of primarily left politicians but also CDA and VDD in the Netherlands had the same opinion. That in these important subjects about democracy, the people should not vote about it but should leave it to the politicians. This created a lot of anger with the dutch people. The front man of PVV was also against the eu constitution and attacked the other dutch politicians about once again ignoring what the people want and even asked for the current government to quit and do new elections.
A lot of Dutch do not agree with giving Greece support all the while Greece makes hardly any effort to change their policy (in the eyes of the dutch people). The PVV Jumps in on this by stating they are against lending Greece any more money. Especially since it is found out that pension money is payed to 4500 former Greek government employees who have been dead for years. Again more then 16 million euro a year are stolen by the Greek people. Claiming it was an error. And the dutch people can pull their wallets to help those Greek thieves out.
I should add that at the moment 9000 Greeks that are over a hundred years old are under investigation to check which ones are still alive.
A lot of EU regulation has forced farmers who raise cattle or do agriculture in a difficult position. For years they have been played around by the (prior PVV)dutch politicians. The PVV wants to attack these kind of regulations and wants to give the Dutch people more freedom once again who always had their own regulations. The details are not important here, it is what the people want to hear.
People in the Netherlands get to hear from VVD, CDA, D66 ,PVDA, Groenlinks(Green Left, a party led by deranged individuals) that they have to work until 67 because the rest of Europe does not want to work longer or retire fast. Again in Greece the Greek government has proposed that Greek people must retire at 63.

In a lot of other EU countries people retire at a much younger age. Dutch people retire at 65 here in the Netherlands. Dutch people will at 67 in the future. Dutch people have always worked and payed the bills. But every time the dutch people can help others out of trouble. The public is tired of it.
The VDD at the time by enforcement of the EU rules divided the public train transport system to increase free market enterprise(This has not changed anything at all). But the VVD went far further then the EU laws actually required. The public transport has become more expensive. The NS and pro-rail, constantly have problems. When it rains , snows, when the sun shines, trains drop out or bridges do not open or there is something wrong with the tracks. This causes serious frustration and it cost a lot of money because people who need to work cannot get at work or start to use the car only to be stuck in traffic. These are common subjects where the politics does not enough to nothing about.
These are just a few examples.
This is not a question of right and wrong, this is about party programs.
This is about every day people who see that that they work hard and that the every time they hear from the politicians there needs to be cutbacks while they see that money going down the drain. The PVV has also a lot of troubling party program points. Such as reducing help for those in need. If you want more information, you are free to look up the website and download the party programs.
I did not vote the few last times. Out of frustration and it is dumb to not vote i admit that. I used to vote for D66 or pvda. But both parties have changed form parties with ideals to parties with opportunistic politicians that can be bought. It used to be primarily the VVD and the CDA that would have politicians that could be bought by money. Since about 2 decades the pvda and since about a decade D66 can be found there as well IMHO. You may think that i am paranoid, you might want to look up at the jobs the politicians hold next to their political careers or right after the political career.
I did look at the D66 website a few months ago. It was only about how wonderful Europe is and that D66 makes itself strong for Europe. Now the website has changed and the message is changing. D66 is once again caring more about the Netherlands as they should do as a dutch party.
As a side note :
Artists and culture(festivals and parties payed by tax money) can only receive money after the education system is upgraded and cleaned up. But that is my opinion.