Honestly, why does no-one ever just plonk a captured Prisoner into a Cryotube? They’re never getting out, have no chance of harming anyone, and can be transported literally anywhere with a forklift truck.
Like, take for example, Jenkins from Halo: The Flood. Guy was in a “And I must scream” situation (Would have been a pretty different ending if Gorrister had just whipped out that massive gun he got from the airship and just blown everyone up), lashing out and trying to do himself in. Eventually, they even send two security guards around with him to make sure he can’t kill himself or anyone else. Why not just freeze him? Literally everyone benefits from this; Jenkins isn’t suffering any more, no resources or people have to be wasted, and it stops him trying to stab someone in the throat. There’s no reason they shouldn’t have cryo pods with them; not only were hundreds left in the POA, and in First Strike it’s shown that they can be jettisoned and still work. Seems like it’d be a great help if someone was seriously injured and needed to get to a doctor if there wasn’t one present.
So, yeah. In summary: why the hell aren’t cryogenics being used to freeze POWs?