In reply box itself, there is a text that says graphic pics/vids are not allowed. If they exist else where it is probably because one of the mods haven't seen it. We have millions of posts, so help us remove them by reporting.
If you feel mod has taken a wrong step, you can complain in the GHQ section to me. I will take a look as time permits.
However, follow the rules and provide sources (reputable news sources) and you should be fine with your discussions no matter how critical they maybe.