Argument, Abuse, Contradiction and Complaining

Many of the internet sites in which believers and non-believers interact contain a lot of personal insults, ad hominem attacks, and just plain verbal abuse. I don't want this site to ever become that way. I do not moderate the comments section although there is one person whose rants I regularly delete. I am a firm believer in free speech and I would love to have this site be a place of intelligent dialogue. I don't want it to become like this episode of Monty Python.