This is an example of what not to do infront of kids, while dealing with pests, it's better (if it isn't a cockroach or anything) to take the pest somewhere else and dispose of it outside of the visual range of the kid.
Or else they learn this kind of stuff which can be dangerous for them!
Fly said: ...and years later they frequent sites like OYP... :D
When they are old enough to understand...
Never said he should grow up into a lover, an abyuser or anything, but you know, you don't want your kid to attack rats, yu's, etc. they could attack him back (if they hadn't attacked him already), kinda how you don't want your baby to smack a dog.