Bryce Harper ejection

[lawump]

Swing and miss for strike three (with no disputed pitches during that at bat) and then slam your helmet/bat in frustration = I (umpire) am looking the other way.

Strike out on a called strike three and then slam your helmet/bat in frustration = ejection. (When player complains that he was "mad at himself" I'll suggest that he wait until he's in the dugout next time before becoming "mad at himself.")

Hit a ground ball, get thrown out at first base by 10-feet (or more) and then slam your helmet = I am walking away (unless the helmet/bat makes contact with me.)

Hit a ground ball, get thrown out at first base on a "close call" and then slam your helmet = ejection.

Context does matter, I agree. However, in CB's play, the play at first base was a "close call". At this point, it doesn't matter why the helmet was thrown. The B/R has just stuck it up CB's backside. On the professional level, this has to be addressed immediately. That's game management on the professional level.

This was a no-brainer ejection.