I've been saying this for a while now - I have stopped looking at some of the threads once they've been hijacked by the 'gang'.

I don't always make a contribution because I work on the basis of 'open your mouth and let everybody know you're stupid' and sometimes I don't know enough about a subject to volunteer an opinion, but I do learn a lot from reading the diverse opinions given by other people. I get very disappointed when an interesting thread gets spoilt by those who aren't REALLY interested in the content.

We can only hope that they'll get bored in time and go away.