There are people I simply refuse to talk politics with. It has nothing to do with their beliefs as I frequently have long conversations with people who both agree and disagree, or some mixture thereof with me. And some of the people I will not discuss them with are very close to my beliefs.
The problem is:
They take other people's political beliefs personally.
Christians often use the terms "Hate the sin, love the sinner" and it's one of our core principles for dealing with non-Christians and badly flawed believers. We need a similar way to deal with politics, along the lines "Hate the belief, not the believer."
There are liberals that I personally like and conservatives I would rather not deal with, but I have encountered people at both ends of the political spectrum who consider people evil because they disagree with them. Now I have fairly strong political beliefs but I realize there are decent people who disagree with me and some very disagreeable people who do agree with me.
This came from a non-conversation with a person who dislikes people simply from their party affiliation who is only vaguely aware of mine. I just watched him demonize other people, whom he has never met, simply because of their party belief. (And he was a GOP himself.)
Now I may not agree with what, say Hillary Clinton believes, but if I had to risk my life to save hers I would not hesitate. It's not about political beliefs. It's about human values that should transcend politics.
Update: I think I need to clarify. There are people who are simply evil, no questions asked. As far terrorist acts go, I would not hesitate to kill someone I knew was going to kill others as it would save innocent lives.