Thank you, but the fix is probably to not care about getting karma bombed. It's a childish thing, so it really shouldn't get under my skin like that. I'd hate to use your time on something that shouldn't matter.
You know, I've been doing some thinking about that. I'm about to kick off a community site and I'm debating whether or not to allow downvoting at all. I think I'll only allow downvoting to 1 karma (meaning a comment is only downvotable if it's above 1 karma), and see how that turns out.