I have seen here, and especially on DU2, has been from those with strong materialistic convictions, who adopt their world views mostly from the pseudoskeptic propaganda sites on net and elsewhere and are sometimes referred also as "neo-atheists" etc. They have used bullying as a consciouss tactic to silence other views (by making attempts to have civil discussions unbearable) and to shovel their world view down the throat of others and are usually eager to defend such behaviour, when done by themselves. And now as DU3 jury system is less tolerant of bullying, some of them are whining about being a persecuted minority. No respect for such behaviour from me, no matter from which world view it comes from.
On the other hand, I've seen that many posters that have engaged in bullying tactics are capable of having also civil discussions, so I'm not naming names and condemning people, but just referring to a modus operandi that people can use and not use.