Because they feel valueless, helpless and can’t see a purpose to going on.
I strongly believe this has nothing to do with feminism and is just a problem of the capitalist society we live in that only treats labour and hardwork like shit unless it can generate 1000x profits year on year. Building and serving a community isn’t rewarded. Everything is about greed and more profits. Feminism can’t solve capitalism. It can’t stop people from feeling it’s fucked up consequences like loneliness, feeling unvalued and committing suicide.