I kind of like Rian’s ‘Jedi hubris’ idea. Honestly, the way these guys turn irreversibly evil if they lose their temper is reason enough to never train a Jedi again. At least normal people can go “oops, I got a bit carried away there - sorry”.
I think Kotor did it best.
I’m not familiar with Kotor myself, but I do have good friends who hold it in the highest esteem canon-wise.