I guess it all depends on where you live. I myself have never seen herbivores that are hunters, but that doesn't mean it couldn't happen elsewhere.
Even squirrels, who we all know eat things like nuts and seeds most of the time, can also turn predator and eat things like insects, eggs, and sometimes even other small rodents.
And, not every carnivorous ungulate is a powerplayer. I know a few who actually play rather literately, and powerplaying is a big no for them. So lumping them all together and calling them all powerplayers isn't exactly fair, is it not?