Saying killing Americans is part of mainstream islam anywhere is ridiculous. Absolutely ridiculous rhetoric. It like saying killing blacks is part of the christian religion because the KKK did it for a few decades at the height of their power whilst asserting christianity. There are however a lot of people and parts of the world who don't like Americans because of pretty straight forward political reasons; heck if you go to france or england and talk to a random french guy on the street, they will often have some very nasty things to say about US foreign policy or the general behavior of the average US citizen and etc and these are some of our strongest allies.
You say it seems like people are not assimilating but this is a huge overreaction and fallacy. When we have a US citizen who commits violent terrorist no one brings up the question of assimilation. Did this guy immerse himself in US culture and was this failure to really buy into US culture the reason why he went crazy and shot up a country music concern? If only that guy had immersed himself a little bit more and bought into US culture he wouldn't have gotten 40 guns, bump stocks, 10K rounds of ammo and shot at innocents before committing suicide. Someone assimilation only seems to come up with brown skinned terrorists and for them its seen as the way to end all terrorism, whilst white guys just get labeled as mentally ill. Anyway the reality is this perception of failure to assimilate likely comes from point samples on the news of bad events. You don't however get news reports that say "50K people from vietnam are doing just fine and also like hamburgers and watching football on weekends".
I don't know if anand is zero generation, first generation, etc. The point is based on his name and appearance alone, it is clear that we all are definitely winning from whatever immigration policy allowed Anand to end up being here.
The rest of your post is basically incomprehensible. All I'm saying is there is a background rate for everything. One car accident by an italian guy doesn't mean we should blacklist all italians from driving.