It could be argued that Ronas's orca girlfriends are a bad influence. It turns them on to see him eat big things, and he's all about turning them on, resulting in situations like this one where a fellow right whale gets a trip through his digestive tract just so he can get some nookie.
Then again, his fellow baleen whales shunned Ronas pretty hard, so some of them at least sort of have it coming. They think he's a freak, and they aren't wrong. So he doesn't feel so bad when something like this happens. 83