Depending on the definition of the word "importance", just about anything can be discussed here. However, keep in mind that rudeness are unwelcomed, as well as any language that are listed beneath the "cussing" list. This is a family environment, and some children do hang out with their parents here.
Be courteous to everyone, for a community this size usually means there are more than just three nationalities here on the msgboard. Any comment directed towards a specific nationality in an act of insult will be deleted by the admins and someone will contact you... be forwarned, you only get one warning before you're exiled.
Opinions are opinions. There is no such thing as right or wrong when opinions are discussed. Do not take msgs as a personal insult or attack unless the person has clarified it as that. If anything happens that you find insulting from another person, please email him/her about your concern. If things don't straighten out within one or two days, contact a journeyman or an admin... both will help you deal with things in private.
Not everyone is going to get along. If you find someone ruffling your feathers slightly the wrong way, best if you just ignore the other person or whatever.
Yes, I know it sounds a bit of a "geez, I better not mess up or I'm in big trouble" post I just made, but relax. It usually takes quite a bit to anger our admins. As long as you show/give a legitimate reason why you may have done what you have done... then I think most everyone will get along pretty well