Kinda alarmist, don't you think?
No, because I qualified it later in the same sentence: not all incels are mass killers, but way too many mass killers are incels.
Here's a list of known incels who turned to mass violence:
George Sodini
Marc Lepine
Elliot Rodger, Supreme Gentleman - I don't need to link him, just Google him
Chris Harper-Mercer
Armando Hernandez, Jr.
Alek Minassian
Scott Paul Beierle
Jake Davison
Tobias Rathjen
Brandon Andrew Clark
Lyndon McCleod
Brian Isaack Clyde
Mauricio Martinez Garcia
Perpetrator of 2020 Toronto Machete Attack - not named because the offender was a minor at the time of the offense.
Tres Genco
there are many, many more names I could put on this list, of men who explicitly target random women for acts of mass violence after a long history of celibacy. I might do that if the women would like to hear more about them, but this already seems like an exceptionally long list of perpetrators who all agreed that women and their lack of GF were the root cause of their violence.
Butthurt incel detected.
Mind expanding on your speculation?
Sure. Incels are aggrieved, entitled, and have very little empathy for others. They may get high marks in school, but they are pathologically lonely. They say they want girlfriends, but when asked to elaborate, they seem to want them to act as a living, breathing fucktoy, they want them for social status, but never seem to have any interest or concept of what having a relationship with another person might be like. That simplification of people into living objects that can dispense what you want if you put in the right inputs is a pretty common deficit in autistic people. Incels have very little insight into other people's theory of mind - they have trouble seeing things from anyone's perspective but their own, and that's another common autistic deficit. Incels tend to categorize other people into just a few different buckets - women are Beckies or Stacies, men are Chads or Tyrones. This need to oversimplify other people is common with autism (need to sort and categorize.) Incels tend to describe the world as operating on a series of "rules" that other people don't recognize as true, e.g. they think 90% of the women date 10% of men. Again, this need to simplify interpersonal relationships to a series of rules, and then to treat these rules as if they were natural law, is common in autistics.
I hope that helps, buddy!