I think the Sbisa case is a bit different because Ehlers is a rookie and he isn't exactly a heavyweight. It was within the confines of the rules but I think it is a lot easier for tempers to flare when someone singles out one of your young players. Much like Prust's reaction to the Virtanen fight. I'd say they are on a similar level as star players with respect to having a bit of an "untouchable" status.
Yeah, nothing wrong with defending your rookies, but Peluso was so out of the league for Sbisa. That was not even a fair fight. Even Ladd or Stafford would have been a better fight. Good on Sbisa for not turtling though.