Strangers? Hell no!
A stranger should not get to decide the manner in which to punish a person's kids nor what is deserving of punishment.
Only people designated by the parent to have that authority should use it.

Thankfully most people don't leave their kids with strangers... and most strangers know better than to take someone else's kids discipline into their own hands.

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"It's never over... BOY!"
The Tall Man, Phantasm III