These are turbulent times, and a lot of people have a lot of things to say. The problem is that the traditional means of getting your thoughts out -- letters to the editor -- is based on space and preference and other factors. Here, you can voice your opinions without having to submit to someone else's specifications first.
The only rule is to be courteous to each other. Respect the fact that everyone has the freedom to express their views. If you break this rule, you break your membership in this community.