Poll
77%
15%
8%
Yup the Joker's alter ego is Jack Napier is the hoodlum for murder of Bruce Wayne's parents in the first Batman movie.then the Joseph Kerr is one of the security officer where his wife and son dies during his pregnancy and kills his doctor.Police Detective John Kerson who was investigating for Bruce Wayne's parents double murder case when Bruce grown up and become Batman.Batman saved Detective Kerson from the hostage taker and throw him to the neutron acid drum.
I have the killing joke too. And yes The mobsters force him to put on the red hood. He had to because he was broke and his wife was pregnant.
But I do recall an issue of Batman (I'll double check the #) in which a Joker impostor steals the image of Joker to commit some crimes. Joker gets angry after reading the headlines and tries to find the joke again (meaning to regain his insanity). He then goes to a drawer and pulls out the red hood. I'm sure of it. So I'm assuming he keeps that red hood to remember the past.