rlange - 4:16 pm on Apr 2, 2012 (gmt 0)
Google wants to know what your page looks like to the user. If you hide your css and/or js, Googlebot can't see that. They might assume that you are messing around with visibility or content flow. They might not lik ethat, especially if you have done a lot of other things to please Googlebot. Just assuming.
Is it reasonable to assume that Google's algorithm would apply a penalty because of a lack of positive evidence for any wrongdoing? Even the government in George Orwell's 1984 didn't go that far.
This might take a while, but don't be surprised to see Google evolve in this direction over time.