American-born, dual citizen here. DON’T DO IT.
First, although I love your enthusiasm about the messed up political system, you aren’t going to keep the bastards at bay with your vote, even if you are registered in a swing state. American politics is some messed up stuff and who knows where it will go in the future. My view is that they’re all bastards and I feel obligated to vote for whoever is less of a bastard. Don’t let that be a reason to get citizenship.
For your other point, I don’t know what the rules are on physical presence, but don’t you get perm res. after having a GC for a while? And then it’s setting foot in the US once every 2 years to maintain it? I could be wrong, but if that’s true, it’s really not a big hassle (relatively speaking) for you to maintain in terms of flights and convenience. I don’t know where you’re thinking your life will take you but it seems like a potentially small future inconvenience to maintain perm. res. there.
Like others have mentioned, it’s really not worth the tax implications. If you want to work while outside the EU, you don’t have to pay taxes on that money. If you are a US citizen, no matter where you work anywhere in the world, you will have to at least file with the US and deal with all sorts of BS. Keep it simple. Don’t do it.