Title, the mere presence of a harm mode has enabled ghost players to grief through, most often, welding fuel tank bombings, and it would be an easy fix to turn it off.
If the design goal of mothroaches are “mice but moth”, I see no reason why their potential impact would not be brought to a similar level.
I think what needs to happen is a split in the free agent rules between “unaligned due to being an animal” and “unaligned due to personal reasons,” with animals still needing to follow escalation rules and not just welderbombing places. I personally like the small bite attack mothroaches have to be able to break into drawers and wardrobes, but that’s my personal choice compared to the multitude of people who use it to grief