What if you were born in the wrong place and your family got gunned down or buried under rubble because the enemy thought a hostage (or their dead body) was in a building at the end of your street?
You can’t always assume you’re the one who is both on a righteous quest and in possession of superior firepower.
The “every accusation is a confession” rule suggests that he was on some meds to help him keep his composure. Definitely not any truth serums though.