"We're allowed to kill these people" is treated as a religious belief which cannot be questioned or challenged because it represents a deeply-held spiritual view, but "be kind to each other" is just a theoretical idea, a non-binding philosophical abstraction, little more than a suggestion, really.
Unfortunately certain religious people interpret "be kind to each other" to support torture and oppression in the name of "saving sinners' eternal souls."
A sort of "firm hand" kindness, they would say, because their deeply-held spiritual views supercede everyone else's.
Convenient how the most deeply religious worship an all-too-human god.