I can think of a suitable punishment........although it does not compare to what awaits them in God's judgement - He say's it is better to be drowned in the sea with a millstone round ones neck than to harm one of these little ones.
In the meantime.....I say castrate them......and put them on an island alright......filled with all kinds of traps and retiles, poison spiders, and all kinds of things.
You can melt their heads off with matches like I did my sisters Barbie Dolls who molested me in the bathtub when I was a young boy.