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it could become risky enough that the cost mitigation becomes untenableWhat cost mitigation are you referring to?
> thick armor plating
It makes about as much sense to armor a satellite as it does a plane. (Much less, actually, given the fuel costs are higher, energies in orbit are higher and densities orders of magnitude lower--to approximate the global density of airplanes in LEO, we'd need something like 4mm satellites up there. To approximate the density of controlled airspaces in LEO, we need about 10x that.)
> violence shenanigans outside my front door
Where the closest object to your front door is 10+ miles away.
