I checked, my reasoning doesn't really apply to global positioning satellites, as they have orbits far outside the LEO, about 20000 km. There's not enough mass

I checked, my reasoning doesn't really apply to global positioning satellites, as they have orbits far outside the LEO, about 20000 km. There's not enough mass there yet to ensure a Kessler cascade. They would have to be targeted individually, a far more difficult task.