No, the juveniles will get schooling and work program.They are terrorists, separatists and traitors.
I suggest the Death sentence. Hanging or to get the shooting squad in public.
"Muh modern times, muh civilised"who cares.. Simples, you are a traitor, you deserve the bullet
The adults will get hard prison time.
Death penalty for these guys solve nothing.
Leverage the death penalty to gleam actionable intelligence from them is certainly possible.