Kon never outright did abusive or really violent pics, though abusive edits and redraws are around. He did however have a yukkuri get shot by an anon... who promptly got wasted by Yuuka (it was a yuuka type). Though that series is untranslated so who knows what really happened.
Besides some light teasing from the yukkuris (as in a prank where a ran and a chen said they were pregnant (but really weren't)), they aren't shitheads.