At least two. There was Alek Minassian

https://www.telegraph.co.uk/news/2018/04/24/do-know-alek-minassian-arrested-toronto-van-attack/

And the other guy Rodger

https://www.bbc.com/news/world-us-canada-43892189

And then, arguably, the idiot who couldn’t take lose at a gaming competition:

https://www.nytimes.com/2018/08/26/us/jacksonville-landing-mass-shooting-madden-tournament.html

All follow the same pattern. They think they deserve things they don’t deserve. So when they don’t get what they want, they lass out.

And while this is murder, is also the same pattern with rape. People who can’t cope with frustration and rejection. Interestingly, that kind of situation happen more in USA and Canada than Europe, so it looks as something cultural.