Controversial opinion but yes, the stochastic violence he invokes has provoked a direct and proportionate response that is morally justified.
Furthermore, people who identify with the dumper are disincentivized from pulling similar stunts. It's a good thing for society when those willing to commit actual violence with hate, trashing the words mmiwg, such as this man, it's a good thing that they now know there is physical danger or danger to their property that comes with their hate acts.