The other aspect I see is that some of the kick-outs are bitter and resentful against the WTS that kicked them out for their behaviour (I'm talking again about those whos behavior warranted it).
The only issue I have with your view is that you are somehow saying that being "kicked out" ie disfellowshipped, is OK. Whilst its true that there are rules in place in the congregations, I personally will never agree with disfellowshipping, no matter WHAT the person has done. Then you see people getting DF'd because they had sex with someone they love outside of marriage, or they smoked. So you can't say that those kicked out are all disobedient tearaways. I realise you were not referring to everyone though.
This doesn't apply to me because I walked out, but for some DF'd ones, I don't think they can be tarred with a certain brush purely because of the DFing.
When they subsequently misbehave on discussion forum like this one (which their anger and obsession probably makes more likely) then they simply transfer their resentment and anger to whoever is responsible and possibly the ex-JW community as a whole (or those who frown on the unwanted behavior).
I'm sure we can all think of examples of these types (well, I can anyway!)
I can see how this would be the case if someone broke the rules on the forum over and over and then got really angry about it. Yes.
Sirona