First card or not, you would no expect someone with previously unblemished criminal record to get a suspended sentence for murder. A slight exaggeration to make the point, but Mitrovic and all players should know what the bounds of acceptability are and that "emotions because football is an emotional game" are no excuse.
As I said earlier, it is a shame Fulham did not post on their website an apology - to their fans and to the football public in general. And what about the referee? Fulham's reputation by two individuals has been trashed but self awareness has never been part of the game has it?