I feel discrimination laws are important to have.
A case like this was not discrimination as he was still willing to do business with the couple.
His only "transgression" against the leftist ideology was being unwilling to participate artistically in an event/occasion he disagreed with.
The reason he was willing to sell the cakes he had already made is that he made the cakes for his business, not for a specific occasion.
NO ONE IS ENTITLED TO YOUR LABOR, REGARDLESS OF THEIR GROUP IDENTITY.