A lot of incels got sold the idea that they'll be loved like how they are supposed to love their women.
I think this is where people should start when trying to understand the phenomena.
You know the meme "Disney movies ruined an entire generation of women with false expectation of love?"
I think the same can obviously be said of men as well. The generation I belong to, le 90s kids, were largely raised on media that portrayed romance in a more juvinile way- that if you were nice, saved the girl, were a gentleman like your favorite Disney or anime heroes, women would naturally fall into your lap in thanks. I think that this false expectation for boys, that being nice, bringing flowers, etc was what was required for sex, is the start of a flawed view of romance.
Add in the fact that a lot of boys and men just aren't interested in women at an intellectual level. I think in some sense men really do objectify women, they're treated as objectives and not really as people necessarily. Ask yourself about incels, and how they don't bother to learn a woman's interests, if they'd be a good match, what she's truly like, customizing gifts for her or to see if you really mesh, etc (look at CwC for a prime example here). Its just roses and generic shit.
I think it may have worked in the past because women were taught to settle with much less and that this sort of relationship, where they're less valued as an individual, was what they should aspire for, so with the modern sexual revolution, and breaking free from that, old romantic gestures may have basic benefit, but theyre simply not enough.
With all the incels out there, who havn't caught on to this yet, obviously this is pretty jarring and it seems a lot of them believe that they "played the game right, why am I not having sex", when the rules of the game changed a long time ago, if they were ever even all that relevant.
I know that the dating game has changed with the internet, and women (and men) can and are equally vapid, but seriously gamers. If its a new game, with new rules, meet the challenge or don't bitch about it. Incels who are bitter but barely even try, I honestly have little sympathy for, and its part of why I come on here to have a laugh. Even MGTOW who know the game, but reject it I have a bit more respect for. Step up, tbh, or leave, or if youre going to stick around but put in zero effort, don't bitch.
For why some incels commit crime, honestly? Theres stuff loose in their heads is my guess, and they seem to center their entire life around the absence of sex, which just gives off mad retard vibes. Chill, jack off to some porn for all I care if it makes you happy, God gave you hands for a reason.