Despite how I may feel about Jameson, the dude does have a good heart. He refused to sell out Peter even when he’s threatened with his life. In the animated series in the 90s, he risked his safety to prove his friend is innocent, and then there’s this.
Despite being a jerk about Spider-Man, he’s still a good man.
His thing is hating people in masks with no accountability. He goes way overboard with it, but his core issue isn’t even That wrong. Once he finds out who Spider-Man is and it’s not a mystery, hes 100% on board.