LEO is not the place to worry about Kessler syndrome.
Mostly, Kessler syndrome isn’t something to worry about at all; there are just a lot of orbital planes available. But in LEO, the mechanics don’t even apply.
Not to be alarmist, but suppose a galactic federation judges that
humans in their current state of development will pose a danger to
other civilizations when they imminently attain warp capability, so as
a safety precaution they need to be confined to their planet for at
least a millennium. An agent of the federation posing as human
manipulates the population into allowing 100,000 satellites to be
deployed. With that done, federation scientists solve the many-body
problem for the exact necessary speed and trajectory of a small meteor
to shatter one of the satellites such that some of its fragments
precisely target its neighboring satellites, and so on, while the rest
get kicked up into higher orbits. Life goes on but any enterprise that
depends on penetrating the debris field becomes infeasible.
Not to be alarmist, but suppose a galactic federation judges that humans in their current state of development will pose a danger to other civilizations when they imminently attain warp capability, so as a safety precaution they need to be confined to their planet for at least a millennium. An agent of the federation posing as human manipulates the population into allowing 100,000 satellites to be deployed. With that done, federation scientists solve the many-body problem for the exact necessary speed and trajectory of a small meteor to shatter one of the satellites such that some of its fragments precisely target its neighboring satellites, and so on, while the rest get kicked up into higher orbits. Life goes on but any enterprise that depends on penetrating the debris field becomes infeasible.