Your own Arizona announcers on TV thought the ejection was a very bad call, calling the ejection outrageous - they went on about it in those terms for a number of minutes (the video with the AZ announcers is on MLB.com). Kershaw will not get a suspension (which is normal on a HBP where the pitcher is tossed).
Had Kershaw not been tossed, he’d have come to the plate and the AZ pitcher would have thrown a similar pitch. There is no way Kershaw thought he’d be ejected and do it anyway - that game was very much in doubt and AZ is a much better hitting team, the Dodgers’ bullpen survived (barely) but there’s no way Kershaw could’ve thought he had a win in the bag.
On the other end of the spectrum: I am a big fan of Daniel Hudson...
That's 100% correct. Grace and Sutton were both ballplayers and know their stuff. I think a larger point was being made by MLB. We've both seen where deliberate HBPs get out of control in a game, and the league is trying to get a handle on it before playoffs start. My wife and I still remember Roger Clemmons deliberately nailing Luis Gonzales in the arm during the '01 World Series, and that kind of unprofessional behavior on the field makes my blood boil.
Personally, I think Parra started it by being obnoxious after getting that homer in the earlier game. One should take the bases in a professional manner without the end-zone dances. But Kershaw should not have made the threat because it painted everybody else involved (Umpires particularly) into a corner where they had to punish him, even if it was way out of proportion to the act of hitting Parra.
Life itself is like that. Be obnoxious enough, and you'll force the PTB to whack you whether it's in proportion or not, just to make an example of you. And I think that's what happened here. It goes to show, people will find a way to get along if it's just politics, but dagnabbit this is baseball!