What is more detrimental to open discussion on a discussion and debate website, tangents of topics or calling someone evil *** belligerent ***.
Well how can discussion continue if someone insists on going off topic? Why should someone take the time and energy to write out a detailed reply if their opponent is just going to ignore or fail to comprehend their post, instead moving onto some other topic? By comparison posting expletives is more a minor inconvenience which can be ignored, although it does give an indication how seriously the offending poster is going to take any well thought out reply.
I've noticed a lot with creationist posters that they will post an off topic question about evolution, making it awkward for someone to reply when they know it's going to be highlighted as off topic and moderators requesting no replies to keep the original topic on track. Sometimes an evolutionist will post a more thorough reply in a suitable topic, and providing a link from the off topic reply. However I've yet to see any creationist poster take such opportunities to support their arguments. It seems like you're not confident that your arguments will stand up to scrutiny.
Instead of flying a martyrs flag, go to topics where you can ask specific on topic questions. You will then get proper replies from Evolutionists and you won't be 'silenced' by moderators. But do ask specific questions, some of us have done four or more years at university studying some aspect of biology and its a huge subject, so simply asking for evidence for evolution is too broad. Take Aaron's topic on whale evolution as an excellent example. It's looking at a specific example of evolution and in the process of reading up about it even those on the evolution side of the debate have the opportunity to learn something new.