Talking about this at work today, we were saying how the NCAP seems to test each car in isolation and not take other road users into account. (Could be wrong though, never really looked past the headline figures)
Say it’s a side on collision at a junction and a 2* Navara ploughs into a 5* Corsa (grades made up), there’s only ever likely to be one winner there. You may be more likely to crash in said Navara but that probably wouldn’t console the Corsa driver. Presumably it’s this kind of logic which leads to the school run arms race.
If the NCAP ratings were equal would it be safer to try and avoid accidents with a safer driving small supermini, get a much more survivable but harder to drive large 4×4 or split the difference and get a family saloon? Perhaps more importantly, which would feel safer?