Why did Jason killed Crazy Ralph

Ralph does not deliver genuine warnings, whaledogs-82256. He gets a perverse thrill out of disturbing others and doesn't care whether or not anyone listens to him. He has made a game out of the drowning and Pamela's death, and Jason is enraged by the mockery.

Ralph was Jasons father, so he had to kill him

Jason is a violent lunatic.
That’s why👍

"and was never a reason Jason drowned in the lake."
I can't believe this wasn't pointed out but except for the girl and boy who were killed by Pamela at the beginning of the original, nobody Pamela or Jason killed had anything to do with his death. Jason killed Alice because she killed his mom. But he had no reason to kill any of these people. He only did it because his mom was killing people and so he thought that's what he was supposed to do. But nobody he killed had anything to do with his death.

He was trespassing, just like the counselors in training. Mrs. Vorhees gave him a pass because he was helping her cause, but to Jason, he's just another body.