The explanation from the producers is actually more along the lines of quality control than vitriol:
What happened was this: we use a lot of prosthetic body parts on the show: heads, arms, etc. We can't afford to have these all made from scratch, especially in scenes where we need a lot of them, so we rent them in bulk. After the scene was already shot, someone pointed out that one of the heads looked like George W. Bush.The head is depicted from the rear left quarter, and has a very different hairstyle than one would have associated with George W. Bush. But the rented head's profile is definitely the ex-President. One would think that images of famous personages would be covered in the contracts between the studio and its suppliers. Enough mistakes like this with a sitting President might result in a visit from the Secret Service. Mistakes along these lines involving people who are controversial for different reasons could easily result in trouble with sponsors.
from io9 (with photo)
It's hard to imagine a famous living personage's image being delivered in a bulk rental of miscellaneous parts. Ahh, well.
Now back up and compare the United States to a lot of foreign nations. Isn't it nice to live someplace where this kind of thing doesn't result in summary execution? What a country!