ultraviolence

noun1

1. •
   Unnecessary, unprovoked (usually brutal) violence; violent acts simply for the thrill and entertainment of it.

   • I gave them the ultra-violence, the crasting, the dratsing, the old in-out in-out, the lot, right up to this night's veshch with the bugatty starry ptitsa with the mewing kots and koshkas. — 1962