The mo-growing is to try and raise money and awareness for men's health issues including prostate cancer and suicide. Movember isn't dumb.
NaNoWriMo is to encourage people to finish their first draft for a novel while being supported by a community of fellow writers. First drafts are always shitty. NaNoWriMo isn't dumb.
No Nut November? That's truly dumb and misogynistic.