For amazon's business model, yes.

Amazon doesn't have a philosophical goal, they are a business with customers. One customer's goal is another customer's nightmare. Amazon has to be a balancing force between everyone's computing needs.

This was probably a marketing decision. Do they want the PR challenge of supporting wikileaks? I doubt it. Either way, they are screwed from a PR point of view. They just took the safer option for the business rather than an ideological one (which seems like an ideological one, but it is more business centric).