In a perfect world I wouldn't really care, you can hide your money from the state if you want to. But we don't live in a perfect world. And we need to pay taxes for the services we get, even if we don't want to.
If everyone followed the law there would be no issues there. But there problem is that not everyone does follow the law, and any kind of criminal activity is very thankful for providing means for them to hide their dirty money, made from drug traffic, slavery, extortion, theft,smuggling,..these are the kind of activities you enable.

So don't kid yourself thinking you are here for the benefit of others, and that Bitcoin will make the world a better place to live in. You are here for selfish reasons, as you yourself have stated.