[ExGeeEye]

You could maybe throw out a 'nits grow into lice' comment to round it out.

One thing I've noticed about all of these analogies.

Truth.

[Prodigal Son]

Wouldn't it be much more effective to just kill all their children then? The adults will grow old and die in time. Without children, no new adults. Just kill the kids. Problem solves itself, no?