Comment Re:Survival? (Score 2) 272
The point GP is making is that many of those diseases cause people or animals to act/move/look slightly "off", and noticing that was key to avoiding them and avoiding infection. The rabid person doesn't look normal. It's not so much a physical thing, it's a behavior thing which still plays into "appearance". It's perfectly natural that a revulsion reaction would be an evolutionary defense for this.
Likewise computer animations are often slightly "off" in the same way - the muscle groups may not work together like they should, or reactions may not be what we expect, or slower than usual.