Forum has guidelines on what subjects can be discussed and religion, politics and guns. Some don't like. Guns in particular have to watch not to touch politics which is nigh impossible given the reason we need to discuss them.
Some Forums like military.com won't let you touch Illegal Aliens nor Muslim subjects in relation to any military or otherwise subject. This is a recent thing. Some gun forums have gotten that way. Faceboox is bad about censoring. Anything controversial or not and some group or person complains and free speech goes out the window. Same situation with twitter. Some newspapers and news agencies are no longer able to connect to unless first rout to one server then another. Some stories appear and then are gone in minutes to hours, not just in foreign press agency site either.