That's the problem - using past examples, there is little reasonable debate. It's just blanket statements followed by fingers in ears while make 'nyah nyah nyah' sounds.
I like visiting here. I like conversing with basically like-minded people while still being able to debate our differences in a reasonable manner. Bringing more 'true believers' over here won't enhance the site, the experience, and it won't change anybody's mind about anything.
The mods do a pretty good job of stomping on 'pure' trolls, but I don't see the benefit of inviting over more people who won't be reasonable, refuse to listen to logic, and say the grass is blue and the sky is green. We'll just end up with a bunch of regular TFL'ers sighing that the board they enjoy has become populated with the very people they came here to get away from.