The Bible has many admonishments about being kind to prisoners.
https://www.openbible.info/topics/prisoners
There are a lot of ignorant voters out there. If you want to make change you need to learn how to communicate with them, not just look down your nose at them.
If it was a Muslim majority country we would were discussing a link to the Quran that gives context would be useful.
However, I don't see an iterated discussion of this as a useful tangent for the thread to take, so let's discuss instead how religious philosophies of all kinds could or should have informed the believers of those religions in the issue of prisoner treatment. What leads to the dichotomy between religious messages of peace, and the warlike behavior of some adherents to those religions?