In a sense, I can see why. Both issues can be touchy and sensitive, and some folks just can't handle criticism and/or differing opinions. Some people are afraid of anything different than what they grew up accepting. And nothing is worse than listening to people arguing with other people, when none of them have the least intention of changing their minds.
Personally, I hardly ever discuss politics because I find it fairly boring. I'm not a tried and true member of any party, I vote faithfully, but I vote for someone depending on their platform during the election, not on what party they belong to. I don't necessarily vote the same as my husband, I think voting is an extremely personal choice. End of discussion. I'm not here to argue, but just sayin.....