I don't think we need to defend or apologize for the Celtics for making a trade. It is a cliche but it is part of the business. I understand that Crowder and IT are going to be upset but as you describe, it could have been worse, say traded to the Knicks for Porzingis or something like that.
I think all the emotions around this will settle down and IT and Crowder will make peace with the trade. They will be cheered when they come to Boston and will add some spice to the games when we play Cleveland in the ECF. They are getting a chance to play with possibly the greatest player ever. In spite of the drama that LeBron seems to create around himself, that is still a pretty cool thing to have done in your life.