Since this is a really big community, its almost impossible to prevent such posts bro. Lets say someone posting a news and its something related to religions.
Then we can't ban him coz its a news. But ppl will fight each other. We can say ok don't insult each other or use bad words. But still its a fight. And you can't put a law or rule to ppl's minds. So its within humans. Humans like to be in groups. And compare each other.
Lets say you and me in same religion, race, social status etc.. but still surely we have atleast few differences. Due to that we like to be in different groups when we come to that differentiation. But all other time we might be in the same group. If you like an IT example just think why Facebook so popular? You cant find hot girls from it like Hi5 or whatever other open networks. facebook is a closed group network. So why people visit facebook? Its because they like to be in groups. They like to feel like family or separated special group from the public.
So my opinion is just banning them or deleting such threads will not end it. Everyday ppl will post and will get banned. So in my opinion we should create separate section for such discussions and it will not appear in the homepage so nothing to worry about. If you really wanna look you can visit that exact forum and debate. If not you can leave it. Its not gonna make problems to everyday elakiri and its members.
Anyway let me know better ideas?

If anyone have i can implement them