That's not their political beliefs, that's their lawyers making a risk vs reward decision. Why is everybody so quick to attribute things to malice when they can be explained by simple pragmatism?
To me the point is that when you start arbitrarily enforcing rules against some people (small guys) and not others (big guys) it smacks of hypocrisy. Maybe you can explain how it was just blind process -- it still stinks.
Treating the big guy one way and the little guy another may be "pragmatic" but that's not upstanding in my book. Sure, it's within their rights to do business with whom they want, but it doesn't mean we can't call a double standard when we see one.