Technology can't fix broken human beings. There is a moral failure here, but it isn't Facebook's. Blaming WhatsApp at best makes the real problem harder to fix, and at worst makes excuses for the actors in this horrorshow.
Nowhere in my post did I suggest human beings shouldn't be allowed to freely communicate – what I'm suggesting is that maybe we haven't built the right tools to enable that safely, and instead, we're exacerbating the "broken human beings" side of this issue.
There is no other side of this issue. This could and probably have happened with sms. This is 100% the mob's fault.
Don't you find that an offensively paternalistic thing to tell whole societies?
You know what? Just ban shouting until people build the right tools to enable that safely.