It looks like they delegate (or have formerly delegated) this type of intention, to paying customers. That of course doesn't mean the userbase: you'd call it 'advertisers' but Facebook got in some trouble over selling off extremely granular access to targeted advertising, to state actors, foreign governments etc: basically whoever's willing to pay enough.
So, if you're trying to create domestic terrorists, it's extremely valuable to be fed information just like your example represents, to sell off access to that demographic.
Facebook doesn't have to consider it 'provocative content', they see it as 'feeding a demographic to a paying customer'. If you're smart enough about your targeting, you can turn it to 'provoke susceptible people into committing acts of terrorism at rates substantially higher than the baseline likelihood of this'. So it's the foreign intelligence agency that is thinking of 'provoking', and Facebook sort of shrugs and fills the order for targeted demographics, without itself thinking much about whether anything is 'provocative'.