I'm talking about both public and private history.
It's far more beneficial to just not make commits like "Derp" or "Whoops" in the first place. Think about your commits and your commit messages as you make them. No, you won't get it right all the time. And that's OK; nobody is perfect, and your history can reflect that you're not perfect. But if you're editing your commit history to fix idiotic commit messages, you're doing it all wrong.
It's far more beneficial to just not make commits like "Derp" or "Whoops" in the first place. Think about your commits and your commit messages as you make them. No, you won't get it right all the time. And that's OK; nobody is perfect, and your history can reflect that you're not perfect. But if you're editing your commit history to fix idiotic commit messages, you're doing it all wrong.