Human rights and just war?

Prisoners of war are absolutely human beings but when it comes to war, are their rights to be waived?

Understanding that war brings in different rules and perspectives. Once a terrorist is captive, should their human rights sort of revert back to them regardless of the crime that they may have committed? Or should they be treated as inhumane savages who should be shown no mercy?

Personally, I feel as though they should be treated as human beings first. There's no justice in attacking those individuals even if committed a very absurd crime. You allow the human law to come into play, which will prosecute them as it see's fit. Torture and things of that nature does nothing but prove that the human laws of life are flawed and need to be adjusted for the greater good of ALL.

In war, there's a different set of rules as I mentioned. Civilians aren't to be targeted, unless they are willing prevented the target from being captured. Say they have weapons or equipment that further prolongs your duty as a soldier from properly doing your job and your life is now in danger. Are those civilians now targets, or do they still play the noncombatant role when it comes to human rights?