Why can't Americans discuss politics like adults?

because some tend to "lose it" when they are wrong when they defend their side of conversation especially when they know the other makes all the sense in the world (i.e., talked about Hillary's corruption and they get their shorts in a bunch. They know she is evil and corrupted and money-hungry but they don't want to hear it nor accept it.

Years of inbreeding

Well, Yahoo Answers...

Because we have agitators amongst us who only benefit by sowing discord!

The best thing reasonable people like us can do is try to educate the public in a rational way.

Jared shows us where you went wrong with your question. When leftists are losing a debate, which is always, they just call names as they aren't informed enough to do anything else.

Die in a fire, contard.

Some of us can be civilized and adult about politics, but... no one listens.

Yahoo Answers is not the place for civil political discourse...and neither is San Francisco or any other liberal infested cesspool. Grew up there. Can't tell you how many times I had some unhinged progressive, mostly militant feminists, screaming in my face during my college years. That was 20 years ago, so the stubborn "tolerant" progressive mindset is spreading like a cancer.

Because the average American has less than a high school diploma, if that! Thus, many Americans are REALLY not educated on subjects that have complex solutions to complex problems. And Republicans defunding education is only making it worse.

I can other places. This is a cesspool. Expect to encounter turds.