It could be that someone happened to post educational videos to the porn site. If so you'd might as well download them while you have the chance, but don't mistake their existence for some indication that that's what the site is for. They're still less than 0.1% of the videos, and you'd need to specifically search for them or be linked to them to find them. Assume you'll need to look elsewhere for educational material. e.g. there are 10s of thousands of results for videos for "Holocaust" on worldcat.