I'm on the Left and I made that clear on the C-D forum. However, I said nothing inflammatory or abusive to anybody. I did nothing one could construe as trolling. However, one of the mods called me a troll and banned me for life. No warning. No explanation. No second chance. Now, I read City-Data threads on numerous subjects for months before I joined. They DO have lots of interesting information about places all over the world.
My advice: Read, but don't join. If you join and one of their neurotic mods doesn't like one of your posts, she can ban you on the spot. After you are banned, you can no longer even READ information on City-Data. All that comes up is the "You're Banned" message. DON'T JOIN THE FORUMS, they are FULL of trolls. The mods are trolls too.