If CloudShare used its own "this is Amazon.com's Cloudshare Service" certificate then it might be okay, except (1) they would be using it to sign content that they haven't verified the authenticity of, which is misleading (like notarizing something without any authentication), and (2) you almost always need to mix those static assets with dynamic assets or HTML forms and that all has to happen on the same domain--the domain that receives the POST requests, not the CDN's domain--in order for things to work reliably.

As for tone: the tone with which I wrote my reply is apparently not the same as the tone with which you read it.

Not everyone is interested in making sure your feelings don't get hurt on the internet. The sooner you realize that, the better off you'll be.