ok…Karkat is serious. Dave hit the nail on the head, Karkat does have inferiority issues, but he isn’t letting that deter him for this. His next line wasn’t defensive or an attack, it was laying out the facts.

Because Dave doesn’t get it. Do any of the kids even know how murdery the trolls are? How they were raised and encourage to murder everyone and every thing?

Karkat is literally trying to save their lives here, or at least warning them.