True, but I view the Golden-to-Silver-Age Joker as an entirely separate person from the one we know today. He was more of a wacky prankster with a slight homicidal edge - he wasn't insane, just extremely eccentric with a warped sense of humor. It's difficult to match up the guy who created the Jokermobile and had his own utility belt stocked with practical jokes with the man who killed Jason Todd with a crowbar and threatened to nuke Manhattan. (Personally, I'm fine with either of 'em.)