LogFAQs > #888285724

They could bake the cake and give it to the paying customer and be done with it.

Instead they choose to be hateful and discriminatory.

They didn't have to have anything to do with a gay wedding. Baking cakes is their daily business. They could have totally ignored the that the wedding was gay, it didn't have anything to do with them. Nobody forced anything gay or homosexual on the bakers.
But the cake makers forced their hate (based on religious beliefs) on the gay people by refusing them normal service.

Discriminatory hate like that leads to a huge amount of suffering in the world, now and in the past. Think violence against same sex couples. Apartheid in South Africa. Women not allowed to vote or study in the past. And still in the middle east. Buddhist killing Muslims in Myanmar. Jews in Europe in WW2. The list is endless.
And it starts with refusing something simple like a customer in a shop. "Go away, I don't like your kind, next customer please!"

Nobody is "forcing" the bakers to make a cake. Making cakes is their business. It's not for them to select who they sell it to. Unless it impacts them in some way. In this case it does not.
What if they refused to sell cakes to jews, blacks, and women?