If it is to reduce distribution because it could incite violence, it seems to me that 1) the vast majority of distribution/awareness is happening via traditional news outlets and 2) distribution and awareness is actually what you want to happen, since it is important that people be aware of the President's extreme rhetoric. If the reason is that the statement is immoral and platforms have a duty to take a stand / pick a side, then I would say that sounds reasonable to me but leaves me feeling a little uncomfortable. It feels like we are applying a Total War mentality to our political discourse, and that doesn't seem like something that could possibly end well.
Disclaimer: Former FB employee.