Cases where the shooter was "sick" and basically asking for help x did it out of pure evil

In what case do you think the shooter was practically asking for help because he was "sick" in his mind? If I can put it that way.

And in what cases do you believe he did it out of pure evil human being?

For example:

I believe James Holmes, Travis Reinking and Ethan Crumbley were basically asking for "help", really sick in their minds.

In other hand, Dylann Roof, Patrick Crusius, Gendron and the Pulse Club were pure evil.