And there is the rub. Each one a piece of shrapnel travelling at missile velocities, each will have many thousands of opportunities to strike others under control in conflicting orbits, to create a cascade of orbiting debris.
People like Dr TS Kelso for example, have studied and spent their lives controlling these things, working with and for organisations like and including NASA, creating some mind bending software tracking and early warning systems, to avoid the disaster of cascading satellite debris collision events.

There have also been many programs specifically to address the problems of space pollution, by ESA, NASA, and most of the other big government funded programs.
Seeing all of that now literally thrown to the wind by the almost amateur venture which is Starlink, backed by armies of hero-worshiper investors with stars in their eyes, the cult of Musk, is pretty painful for anyone involved long term in space technology to watch.
Do you know what the worst case outcome is, if the debris from a single collision results in another collision?
I will tell you, loss of all satellites, perhaps even ISS, and even those at higher altitudes including geostationary.
That would be the end of most global communications, which we now depend on for life, literally.
The debris from a collision event doesn’t just stay in one plane, it goes in all directions including upwards.
LEO orbits are the highest velocities, so most damaging in collision events.