You are right, that's possible... good point... BUT...

if you have a small car and you want to make a SUV or truck rollover, just hit the truck's wheel That's how you do it.

Because the SUV and truck has higher body and bigger wheels, and the small car is just opposite, so when a SUV is going in high speed and may be roll on top of the small car's front bumper and then flip over. Because the SUV was going in high speed, the impact from roll over can be very severe.

In that case, any small car to do that trick (in theory). However, the case study here is:
When a big SUV - Ford Explorer, hit a small Mazda, the Mazda was damaged badly. That makes perfect sense. It has nothing to do with the car maker, it's purely just the natural of physics. My point was: if it was a MDX to hit a small car like Dodge Neon, the result should be the same,

Sorry, really no offense to any small car owners, but just want to point out that safety car is based on model (which usually is directly proportional to the price) , not by brand or country.

Also, your point is good, nothing is perfect, there are still a small percent of chance that a small car can win a bigger car. But again, the chance is by luck...