I just want to quote the IIHS to inject a bit of reality into this:
They also say that 88% of those fatalities were from rollovers, so for the 2WD model that means 3.3 fatalities per 10,000 accidents were fatal rollovers.
So, assuming every single Bronco II you saw was 2WD, you would have had to see >10,000 of them roll-over to have seen ~4 of them fatal, statistically. You would have had to see even more if some of them were 4WD, which had roughly 1/2 the fatality rate.
One statistic (not the IIHS) pegs the total number of fatalities for Brono II rollovers at 260. They sold around 700,000 of them, so that's 1 fatal rollover per 2,692 vehicles, so going by that statistic, if you saw 4x fatal rollovers, you saw 10,770 Bronco II's. But that's then buggered up by the fatality rate and the fact that not all collisions are going to yield rollovers let alone not all rollovers were going to yield fatalities.
One more recent statistic pegs the total number of deaths at 800, which means 1 death per 875 vehicles. So you'd have to see 3,500 Bronco II's with a mind boggling number of them being in accidents to yield the number of fatal rollovers you claimed to have witnessed.
Put another way, let's say 20,000 Bronco II's made it to the state of Virginia. That means in total, there were, from 1984 until now, 23 people in Virginia that died in the Bronco II. That's less than 1 person a year; a little more than one person every two years. If you saw 4 of them, you personally witnessed 17% of the total fatalities in that vehicle in that state. Do you think that's likely?