Hey, I can wax sanctimonious as much as anyone about theft of intellectual property, respecting copyright, etc.
But that would make me a hypocrite. Why? Because I've done my share (not that much, admittedly) of uploading onto YouTube stuff that waren't mine.
And what's more, I don't hesitate to watch YouTube videos of material where copyright has obviously been breached. (I chuckle whenever someone uploads something, then says in the description, "I own nothing" or "No copyright infringement intended," like that's going to give them immunity.)
In short, I regard copyright the way I do traffic laws - I'm officially in favor of obeying them, but have been known to break them "accidentally on purpose" from time to time. If caught, I own up - but that doesn't stop me from making "exceptions" now and again. And, to be honest, I don't expect to stop anytime soon.
So sue me. (You, not the copyright holder - they might actually have a case.)