If corporal punishment is effective then we don’t have to terminate anyone’s education. For some kids it may just take one painful lesson to turn them around so why forgo that and ruin their lives?
Certainly, if they also don’t care about physical punishment then expel them as a hopeless case but don’t do it reflexively as a cop out.
If it’s effective, yes.
I think corporal punishment is fine as a last resort before expulsion. Not before, because I’m worried some kids would be traumatized, but those expelled or misbehaving indefinitely without consequence will otherwise find trauma and/or ruin other’s lives.