Orcas have been such bros to humanity (no wild orcas have ever been recorded intentionally attacking humans) that if they're hitting boats I'm starting with the assumption that it's the humans fucking up. There's a lot more history of humans being cruel/stupid to wildlife than there is of orcas doing the same to us.

Orcas have rarely injured and in one case killed their trainers when held captive, but that's essentially them fighting being held hostage. “No one is sure what causes the animals to react in this way, but boredom, frustration and ill health, both physical and mental, have all been implicated,” says Rob. “These incidents have resulted in serious injuries to trainers and, in one case at least, proved to be fatal.”