I was spanked as a child — I bloody well needed it too. Certainly taught me to respect my mother and that swearing, throwing objects and having pointless tantrums had a consequence. Did I die or do I have brain damage? Ummm nope! But I certainly have respect for my parents and superiors at work.
And with letting children cry it out - yeah, absolutely. I was a little dick for having paddies over things like not being bought the latest Barbie, my mum coming home without a magazine, not being able to watch my TV show…again, it taught me to have some flippin’ respect. Unlike the majority of kid these days - my parents actually cared enough to mould me into a decent human being.