I think that is what a lot are debating.
I agree, we need to deal with them.
But we have hoping for the best on one end and
killing them all on the other.
We need to resolve ourselves to do what is necessary to solve this problem - even if the only way to do it turns out to be "kill 'em all." Only then will we be in the position to convince to modify their behavior in such a way that we won't be forced to do so.
I hope there's a less bloody solution. But under no circumstances will I let my desire (and more broadly, the general desire among civilized people) for a less bloody solution become an enemy strategic advantage in his quest to kill or conquer us.