It's easy to say Kings should have traded DMC prior to the start of the season, but you also have to consider season ticket holders. How many people would have purchased tickets with the roster the Kings have now?
They pulled the chair under their season ticket holders and they pulled the chair under Joerger (although I'm guilty of speculating in this case, because we will probably never know, what role Joerger played in the trade).
It's either a panic move and complete lack of foresight or actually really bad and "immoral" business behaviour.
Btw. did they pull the trigger on the trade, before people needed to renew their season tickets for 2017/18?