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Ian K said..
We've entered the arms race. Your intuition is correct. Bigger is better. Forces are equal and opposite, F=ma. It's the peak acceleration that damages passengers.
You can understand parents joining the race. Your peers take their kids to school in Prados, Pajeros and Everests. You could all fit in a Corolla but is it worth the risk?
Do your bit to reverse the trend if you haven't got kids in tow. Get the smallest car you need. Survive on your wits.
(Interesting finding, that the drivers of larger vehicles feel invincible and are less likely to keep their hands upon the wheel!)
The global marketing of station wagons with big wheels has been very successful. The safety aspect however I feel is somewhat distorted. Certainly a high mass vehicle is advantageous in a head on collision with another vehicle (as long as it's smaller than yours). However, statistically the number of fatal head-on's in Australia is a minor piece of the motor fatality pie.
The biggest piece of the pie belongs to single vehicle accidents where drivers have lost control. A swerve and an over correction in a traditional car is likely to leave you with a brown undies and skid mark of both sorts. In a vehicle with higher centre of gravity on higher profile tyres and suspension, the chances of rollover are much higher. When that occurs, absorbing all the energy of that greater mass has to be done through the roof and doors - something they are not nearly as good at doing as a crumple zone and engine bay.
There are a plethora of dash cam moments of SUV's being toppled at residential intersections and highways with relatively minor shunts on the rear quarter. Similarly, watching SUV's attempting the 'Moose Test' is often somewhere between comical and scary. So for mine, it's a triumph of marketing over reality to portray SUV's as safer, but regardless, paraphrasing Ian, driving with your brain engaged is probably the most effective safety feature.