Starlink satellites are initially launched into such orbits, then use their built-in thrusters to raise themselves to somewhat higher orbits. If somebody's lau

Starlink satellites are initially launched into such orbits, then use their built-in thrusters to raise themselves to somewhat higher orbits. If somebody's launching "blow up a box full of BBs" weapons into orbit...their ability to control even the initial orbits of all those BBs will be kinda limited. (But if 10% of a million BBs go where you wanted 'em to - probably good enough, eh?) BBs with lower perigees may fall out of orbit within days - but that's plenty of time to hit something, if a particular orbit was being targeted.