I started by looking at the original '17 most inappropriate PM sets..' and was surprised at what the authors considered unsuitable for children, until I realised it was tongue-in cheek (to say the least). I guess every parent/adult responsible for children has to make their own judgement about what to allow/encourage their children to play with. As a child (back in the 60's) I was never allowed any form of toy gun, but my brothers and I did play 'cowboys and indians' with Britain's plastic models. However, I did develop strong pacifist tendencies from my parents' attitudes. We all influence our children in different ways, sometimes unwittingly, sometimes what we do verges on indoctrination. The PM zoo we gave our children for Christmas had no Polar Bears in it, a conscious choice (real Polar Bears are said to go mad in captivity).
Actually, I think some PM items are merely confusing for our children (in the UK)- the post-boxes, phone boxes, armed police, etc. in no way reflect their day-to-day experience. But then I think putting humans with dinosaurs is daft!