User blog comment:MrAnonymous/I think that killing Dick may have done more harm than good./@comment-5120709-20120520065614

The problem they had under Dick was that it was hard to figure out who was a Leviathan and who wasn't. Since they weren't eating you couldn't pinpoint them.

Now that Dick is dead they apparently lost their intelligence so they'll start feeding like any other monsters, so it'll be easier to find and stop them