I lived in central Europe for two years. Had to wait in line for 20 hours halfway through my time there to renew my visa, otherwise it wasn't much of an issue.

Ok so you know what a visa is then.

So on your visa if you did anything bad, what would happen? Get your visa taken?

Here's one big difference. Do something bad, your green card might be taken. When you're a citizen? Nothing happens

And that's just one example...