Not very much? Doesn’t everybody think like this in one way or another? I certainly know what is better for the world than the majority of the US.
People who look at someone else and think "you should just.." are normal. We all do that.
People who look at the world and say "everyone should just.." are the height of arrogance and epitomize the phrase "The road to hell is paved with good intentions."
Probably. But lots of people realize they've been wrong before, might be wrong on this occasion, and therefore don't just put their ideas over everybody else's. That's the non-arrogant way to handle that, I guess.