Personally I think you have given people the means to shut up opposing views simply by crowd abuse of the flagging system. You have probably given yourself extra work as well deciding what should be censored or not. If it were me I would simply leave it for people to get on with what they are saying and if it's obviously abusive then delete the post regardless. Why make a load of work for yourself, Maria? I would not employ any of those systems
Honestly, in my view there are some people that are so full of their own beliefs that they will not give up until they have bored all opposition into submission with endless nitpicking every last detail of an issue and going on and on in long winded statements that probably don't get fully read anyway. They just have to have the last word and half the time they are not debating, they are dictating and flooding the comments. I have seen it here time and time again of late so I have stopped even reading some of the articles that I think will just bring that kind of a response. Or, at least, I will read the article and ignore all the comments.
I have learned one thing about so-called debates on blog comments, and that is if you argue with a fool enough no one will be able to tell the difference.
Good luck with it anyway.