Congratulations: you managed to type a bunch of cliches and baseless statements that you've heard someone else say without doing a lick of research on your own.
I'm going to guess that you haven't researched what percentage of current prison inmates faced the same kind of "discipline" that Peterson's son faced. You forgot to use the "beat your kids, or the cops will do it for you" cliche, but it turns out that the majority of prisoners experienced both.
I'm also going to guess that you have no idea how "discipline" actually works in this country, and assume that what Peterson did doesn't happen anymore in homes across the US (again, only because you heard someone else say it), when in fact, it happens all the time. Almost every credible survey or research study indicates that between 80-90% of parents still use a physical form of discipline, so save your tired "kids of today" generational platitudes for someone who'll nod and chirp them back at you like a trained mynah bird.
But here's why I'm convinced that you're just talking out of your backside: you make the huge leap of taking what Peterson did and try lumping it in with average household "discipline". That alone tells me you have absolutely no idea what you're talking about. Either that, or you're a savage.
This isn't about a "spanking" debate, you mouth-breathing Neanderthal. It's about a brute who stuffed leaves in the mouth of a preschooler and beat him until he bled, and the people who mindlessly chant his name on Sundays anyway because he can score a touchdown. If Peterson's parenting (to a kid he barely knows, mind you) fits with your idea of "discipline", then I'd say your own problems are worse than any you want to attribute to those godless miscreant kids you're so busily wringing your hands over.