I don't think anyone is claiming that Insane Clown Posse were the first band to wear facepaint (ever heard of KISS or Alice Cooper?). The point is that their whole schtick is to be "insane clowns" and thus the clown facepaint. If you want to see something that the guys from ICP
really seem to have derived a lot their ideas from, look no further than the 1988 move
Killer Klowns from Outer Space.