As you may know there have been a variety of background for mass shooters.
A woman shot up google headquarters when youtube demonetized her videos:
https://www.theguardian.com/technology/2018/apr/04/nasim-najafi-aghdam-youtube-shooting-demonetisation-payments-father
A trans person shot up their school:
https://www.reuters.com/article/us-colorado-shooting/transgender-teen-sentenced-to-life-in-prison-for-deadly-colorado-school-shooting-idUSKCN24Q00D
And there's so many mass shootings in gangland in chicago you can't even list them all out.
But the press likes to push only the ones that meet their man-hating narrative - when the shooter is a white man - like recently:
https://archive.ph/hSkPM
Apparently this is his reddit post history:
https://web.archive.org/web/20210813174435/https://old.reddit.com/user/Jake3572
**Of the last 24 posts he made - 12 of them were to one of reddits protected man-bashing hate subs - **IncelsInAction.
The sub description of itself:
This sub is for mocking the antics of anyone who identifies themselves as "incel." This is a term popularised on Reddit and 4chan meaning "involuntarily celibate" i.e. men who can't get laid. Some of them get really really mad about it, and here are their stories...
...
Incels who comment in here can expect to be relentlessly mocked by this community. If you don't like it, don't post here.
Did reddit's protection of it's anti-male subs contribute to this shooting?
It seems a lot more plausible than the banned "men going their own way" sub.
The exact opposite, actually. Your analogy here would be calling someone who seeks out grannies and great-grannies and calling them a pedo. They're a sexual oddity, but certainly not that one. In case of ESL (English As A Second Language) issues, I'll break it down for you:
InCel is a shortform for IN-voluntarily CEL-ibate. Involuntary means "they are unable to deny/disagree/break away from", and Celibate means "one who does not have sexual relations". Put the words together and you get more or less "one who does not have sexual activity, despite their own efforts otherwise".
To contrast with what you described would likely be MGTOW, "Men going their own way", who are generally VolCel: Voluntarily Celibate. Not always, there are some who merely eschew relationships but not sexual relations, which often overlaps into the TRP territory, but "usually" it is the case. They, through paranoia, fear, caution, or bad experiences, actively avoid relationships with women. That is, there is effort and will put forward into their situation, it is a voluntary situation.
Think the difference between... The town leper, and the town priest. No one wants to sleep with the leper, as he is diseased, but he has urges and desires to sex the passing women he sees in the market as he begs. He wants sex, but is celibate because no matter what he does, he is a beggared leper. The town priest, by contrast, is affluent, well-employed, clean, and respected: Many women would be willing to have sex with him. But he has a vow of celibacy, so he chooses to not engage with the sins of the flesh, remaining celibate not from circumstances in nature, but his own free will. He is a MGTOW of a sort, and a VolCel for sure.
They're just an internet punching bag. People don't want to blame negative outcomes on their own actions, so they blame arbitrary other groups.