But that's still beside the point: there is still a fraction greater than 0% of his voters, who will feel (correctly or incorrectly) that their politician was censored. And therein lies the problem with the blocking decision.
It does not matter in any shape or form whether Facebook was right or wrong in their action in blocking Trump: This decision will radicalize more people, as a direct side effect or unintended consequence of their decision to block him due to the TOS violation. Trump is not just some internet lunatic, he is a political candidate and former POTUS that 70+ million people voted for.