If they can't guarantee the safety of the people using their software. Facebook shouldn't be allowed to operate.
The same is true for venues, sports, shops, workplaces, etc... why not software companies?
The same is true for venues, sports, shops, workplaces, etc... why not software companies?
People commit crimes inside businesses all the time, and under most circumstances the owner of a business is not liable for damages resulting from a third-party committing a crime on their property. People also use various communication tools to advocate and plan crimes, and the operators of those tools are almost never liable.
What's different here is that Facebook makes decisions about what content to show to people. It uses an algorithm to do so, and it is aware that the algorithm has a tendency to promote violent content. While I'm broadly for platform immunity, that seems like a good situation to add an exception.