The dehumanizing and othering of worldly people made it easy to stand at their doors and talk about how we'd like to live in their house after Armageddon. Once you dehumanize and detach from others it's easy to no longer be able to take the perspective of another. The JW community is full of people that lack empathy. We were deadened to our own feelings, often self flagellating, and the same was projected outward.
The organization is narcissistic. Most either adopt those traits or end up codependent and serving the organization to find an identity. Either way we were consumed with ourselves as JWs or concerned with getting approval from other JWs and the big J himself.
So we didn't often have much chance to have a heart. We were made callous to feelings other than things like fear, for the most part. We were isolated from others and our true selves.