"There aren't any." I'm assuming you don't watch him play very often. If you've taken the time to watch how he played a few years ago and how he plays now it's light and day. I don't even understand how someone can argue with that statement. (unless you don't watch him play which obviously you don't) Look up his penalty minutes and compare them year to year. However, since you're a bruins fan I'm sure you won't even consider accepting him.
You're kidding me, right? Let's look at Erik Karlsson, shall we? Yes, the cut was accidental, but he was still TRYING to hurt him on the hit. It was still a DIRTY hit. And then again TODAY, another DIRTY hit.
You can show me five clean games, but I can show you five dirty hits. Fewer penalty minutes doesn't mean he's a cleaner player. That hit on Adam McQuaid wasn't illegal, but it was DIRTY. Do you see the difference? I'm guessing you don't, because you're a Penguins fan, you won't look at him for what he really is.