The leg sweep will never not be: A. an incredibly effective tactic against humans in general and B. fucking hilarious from an outside perspective, like oh you wanna fight? How about you do that from the fucking ground.
It's been years since I looked at it, but there's videos on YouTube showing just how awful most "self defense" techniques are. Sure, it's great as long as you're prepared and it's a predictable attack by someone who knows the routine and cooperates.