[Jamie89]

Originally Posted by Northern Monkey

However if gay marriage is against the law in that country then making a cake with a gay marriage slogan is endorsing crime.

It's not endorsing a crime... even though gay marriage itself wasn't legalised, campaigning for it was perfectly legal. So the bakery weren't being asked to do anything that would contradict with any law; they weren't being asked to conduct a marriage ceremony, or endorse a marriage that was due to take place illegally, they were being asked to produce a slogan that was associated with a campaign (which again, is completely legal).
And there was no implication that by producing the slogan they would even be endorsing the cause, just as the case would have been for any other political/social etc slogan, they'd have produced it because it's what the customer wanted and it's the service they were offering - everything from the customers side was in line with the law as well as being what they'd reasonably expect from the business (which includes expecting that the business owners wouldn't consider themselves above the law because of their personal/religious beliefs and free to discriminate at will because of them, which is essentially how they acted and what their defense was).