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It'd be similarly ignorant to praise murdering your enemies. Sure no doubt about it, it's really effective. Doesn't mean it's legal or ethical.
These things are brute force hammers. If you really think shaming has value, read the Scarlet Letter.
And we all live in a "reptilian brain context". I'm not sure what other context there is. It makes no sense to reason about society as if we weren't all half a chromosome away from a chimpanzee.
Find an on par opponent and you'll get escalation of shaming, get your ass handed back to you with wit, or the person will just ignore you.
So I refuse that it's effective. It's perhaps been effective for you, self selective bias. You probably don't shame people you've sized up who won't respond to shaming the way you want.
But yeah, I totally only believe this because I'm a successful bully (◔_◔)