How do/would you feel about your child's babysitter smacking them?

How do/would you feel about your child's babysitter smacking them?

Like when they do something that would get them hurt; climbing on something, running in the street, or hitting other children?

I think that it is wrong but I heard a conversation where people thought it was OK. Which way do you think?
How do/would you feel about your child's babysitter smacking them?
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