Yes, there are trade offs with the US government's system of electing representatives within its government, trade offs the country seems to be willing to accept, given its lack of mobility on electing people who would make changes to that system.

And while it's true that, on the margins, the will of the people can be nudged one way or another, you still have to find a whole lot of people to vote for you in order to get elected, and those are your fellow countrymen who do believe those wars you mentioned made sense at the time (for example). You may call those people as many names (e.g. "immoral") as you like, they're still entitled to their votes, exactly as you are.

There is no "them", it's just "us". The divisive rhetoric you're employing is, in my opinion, more problematic than the voters themselves.