New threads from registered guests

Excuse me Misters TomChick and Mark Asher, is there any way to prevent registered guests from starting new threads? They all talk a bunch of crap and lack perspective concerning the fundamental issues of gameplay vs. graphics, console vs. PC, and whether Hitler was all that bad. Why, compared to these neo-Nazis, Hitler was a wittle cutey shnoogums. Actually, I’d like you to ban them all together. I know, I know, if I ignore them, they’ll go away, but I just can’t help myself. They’re so stupid!