There is no reason behind evolution, attributing any outcome to an evolutionary benefit is complete folly. Literally the only answer to an evolutionary outcome

There is no reason behind evolution, attributing any outcome to an evolutionary benefit is complete folly. Literally the only answer to an evolutionary outcome is that a mutant nutted in a bunch of people. Everything after that is also happenstance. If we are to accept that societies with grandparents propagated some genes better, then we have to do the same about cancer, as if its not a complete random fuckup that we have short telomeres or whatever else. When a different explanation fits the model better: cancer tends to occur after reproductive years and therefore wasnt weeded out of the population by evolution, which would apply to people that live long enough to be grandparents too.