I think from reviewing this thread that people are confused.
Disney is not preventing the film from being distributed. They are merely backing out as the distributor of the film. No one is claiming that there was a contract in place binding them to do so.
Disney will still make a bundle off the film as an investor.
So what's the big deal? There was no contract. Someone will pick up the distribution and make a bundle, especially now that the film is controversial. No free-speech rights were harmed. No puppies were killed.
Freedom of Speech does not mean that I have to listen.