Because these guys had no idea what they were doing, and had to forcibly INVENT the medium. Imagine if you had absolutely no idea how to build a car but were given the basics of what one looks like. That's what the Fleischers and Disney's boys had to work with.
I am smiling right now because I know sometime in the future you'll you'll get hit by a car or get cancer...or stub a toe anyway thats what I'm smiling about.
I was expecting some hashishin to come out of the shadows and stab betty in the neck but hey. all I got was a sad dog and some spiders and a senile with a mile long beard and a squirrel too
Historical fact: it was shit like this that later got banned and forced them to de-sexify Betty Boop and make her generally less boring. Ah, to be with the MPAA back in the heydey of censorship.