I'd bet facebook could afford it.
Also, it seems like having a 3 strikes policy on accounts that post this stuff would be a good idea, too. Protect workers by ensuring that they're not moderating one angry nazi that gets every other post flagged. (maybe they already do this?)
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These are called emotional support animals, and they are totally a legit strategy for helping people cope with emotional trauma.
Knowing someone who used to work on their moderation/graph integrity team, whatever they're doing, it's not enough.
Of course, that would require Facebook to spend money, and add headcount.
And we know that they only hired these people as a Public Relations exercise.
If the firehose of internet garbage can't be safely handled it's time to get rid of it. We've banned dangerous chemicals. Time to restrict Facebook, if it is a health hazard to its workers.