Bats leave a stain.
Flamethrowers are too slow...
But A Mark 6 Atomic Bomb will leave pedophiles blown to bits screaming "¡Solo quería violar chicas!".
overkill? Pffft... It'll Only Wipe Out about half the region!
BTW there's no such thing as overkill. If it totally annihilates your enemy your on the tight track.