I think that if i had tried and failed to get my message across enough times then it would be time to use intelligence.
Try being a bit more subtle, i.e. covert.
Deletion of threads, me? Dunner be daft, that would indicate that i actually put some value on them. Nah, take it all with a pinch o' salt. I don't mind a bit of stick me.
I just find the repetitive stuff very tiring. I also find one sided arguments disturbing especially the 'mob rules' ones that sometimes crop up from time to time. You know, those ones where you have to use lots of quoting and different smiley characters just to nail it home. I think they call it a bandwagon...?
Well do what I do: ignore the threads which do not interest you - like football and racing cars.