If it's a sweaty fat dude living in his own filth, then yeah, some exercise and habit changes really are in order. Or if you're completely anemic and underweight. But generally you don't need to go to the extremes of plastic surgery if you just want to get a girlfriend.
If you excuse my spergery for a moment, I feel that Incels simply project their mother onto women and that's where most of their issues come from. How do you get your mother's attention as a literal infant? By crying and complaining. If that doesn't work, moving on to insults. We all talk about how these echo chambers facilitate and breed such behavior but I feel that what's equally responsible for this is the media outrage and especially emotionally charged reaction from women, be it the social justice freaks or just bedroom feminists - if it's feminine attention, it's good enough for an incel and it means the complaint to their mother landed. In some ways, the mentioned women have similar issues of their own and their coping mechanisms aren't too different thus causing a feedback loop of sorts. Also, the whole obsession with women's virginity and "purity" sounds more like some sort of a way to better facilitate this projection since the mother is seen as a special figure of sorts who is above having a sexuality of her own.
TL;DR Feminists want to hatefuck Incels and the other way round too.