That's all retconning.
Dude showed up with a message for peace, was murdered and his murder is celebrated. Literally, a bunch of people running around pretending that's what he wanted. The propaganda is so strong that everyone just accepts it as fact.
It's really not much different than claiming a women wanted to be sexually assaulted because of what she was wearing.
Yeah, no shit. They wrote a bunch of books with varying accounts claiming exactly this. All retcon. All written decades after the events. The Bible is bullshit.