Germans, definitely. They're nuts over there about violence in computer games. All the humans (if you want to call them that) in Turok got replaced with robots, which really is quite strange, since when do robots build little wood and straw huts for themselves to live in?
Also, I really doubt GoW PAL is slower than the NTSC version. 3D games generally do not synch to the vblank rate anymore, and if GoW really did run 20% faster, it would be near unplayable for most people considering the PAL version really is quite fast already.