Hasbro has done it several times. Just because they haven't found every single uploaded episode and taken it down before you could watch it doesn't mean they don't want it up.
I ran a stop sign and jay walked today. Police didn't magically spawn and arrest me so it must be okay.
---------- Post added 2013-01-24 at 12:20 AM ----------
There is nothing to convince, he's already a pirate if he is watching MLP on youtube. I'm just pointing out the flaw in his moral beliefs which allow him to illegally watch MLP but not illegally watch other media.