lol.
Look, even you're smart enough to see the problem with this. In nearly the same breath, you go from "The law is the law, and that's that!" to "Yeah, this law does kinda suck. I don't really understand it.".
So, you're telling me you can't see the problem with "the law is the law, no questions asked"? You can't see the problem with, "Well if you aren't doing anything wrong then you don't have anything to hide!"?
For the most part, laws are arbitrary. Yes, many if not most of them serve a purpose and contribute to the greater good. However, laws are most certainly capable of being
wrong or
bad.
As an example, do you drink alcohol or smoke cigarettes? Even if you don't, I'm sure you know many people that do. Here in the US, alcohol was illegal for a short time. According to you, the moment it became illegal, you would not take another sip - even if it was your favorite thing to do after a long day's work. Then, 13 years later, on the day it was repealed.. you would pour yourself a nice scotch on the rocks?
You can't see the arbitrary, meaningless absurdity in that? Most people can. That's why the mob became rich and flourished during alcohol prohibition.

People didn't care. As they shouldn't have.
It's really not much different than speeding. It's against the law, people still do it. They take their chances.
Let's face it, doing drugs is fun. Alcohol, caffeine, nicotine, marijuana, cocaine.. The human species very much enjoys altering its state of consciousness, for better or for worse. It doesn't matter to most people that some drugs are more or less arbitrarily illegal, while some are not. That's just people being people. It's actually a pretty logical conclusion; obviously the one that I've come to and I'm a logic driven person.