You only have to spend a little time in the political forums to discover:
1. Many people have very different opinions on the same subject.
2. Most are one hundred per cent sure they are right.
3. Most are really sure they can change the opinion of the people who disagree with them if they:
a. tell them over and over why they are wrong to have a different opinion.
b. tell them they have their facts wrong
c. tell them they are stupid nincompoops.
4. That none of the above techniques actually work
Once you figure out that that is pretty much all that is going on over there, it's easy to stay away.