> I don't understand why Facebook needs to block content.

It may not need to, but it decided to do so years ago. And when breastfeeding or breast cancer groups get blocked or partially censored, it's hard to understand why rape apology groups are allowed to remain.

Because if they don't they will lose some advertising contracts. Facebook's reason to exist is to try and turn a profit, not to exist as a place for people to post without censorship.

I imagine someone realized that people who would leave if sexual assault 'humor' was banned make them less than the advertisers who would leave were the jokes not banned.

you don't understand, facebook is doing this for the benefit of their users/customers