Israel already held ~11k Palestinians in indefinite military detention without charges, prior to Oct 7.
AKA, hostages.
They just released 2k as part of a swap a week ago, but are still holding more hostages than Hamas: https://www.reuters.com/world/middle-east/who-are-palestinia...
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October 7 was horrendous, but it's not like history started from a blank slate that morning.