Give him something to play with, Bulls have to use up excess energy if they are bored and don't have cows to breed
Some of our bulls find the Dozers fun to rub on and they are large enough that they can't move them, we also have a few felled trees that lightning killed and they rub on those, they are way too big even for the dozer to do much with, but the cattle love to scratch and polish them, gives them something to do
Bulls don't set out to break stuff, they are just big and it hapens, they are cows, very small brains, not too intelligent, and they certainly don't think up malicious things to do to make you mad