You mean on newsposts?
Yeah, you can actually remove them. As a matter of fact, you can pick and choose which ones you want to remove, make it so all comments are approved, or just disable them entirely.
If you're talking about topics on the bbs (I really can't tell based on how you phrased everything) then you can just sit back and let the mods take care of it in the unlikely chance your topic does get spammed.
Basically both of them amount to just having patience.