My Dad, who used to build houses professionally and has been renovating his own house recently in preparation of selling it, told me the other day "Check Youtube before doing anything around the house. There's so much information there, tips, tricks, things I never encountered back in the day."

So yeah, I would imagine they probably do watch some videos on their profession on there, like I watch videos about game design and programming on there sometimes.

You're missing my point. I'm arguing that self-defense is like a plunger... something you don't want to be without when you need it. And, like plumbing problems, it's a privilege to say "well, just have a professional deal with your violence problems".

But, yes, there are a few extra steps to unclog a bathtub with a plunger. YouTube videos are pretty handy there.

I'm sure.like any professional they use the tools at their disposal. There are new makes and models coming out every year. Why wouldn't a professional use YouTube as a reference? Would a programmer get scoffed at for referring to stack overflow?