Why do so many humans struggle with the concept of compassion?

[Sacred Fool]

Most people aren’t strong enough to stay soft hearted in a generally cold, some what destructive to hearts world.

Open heart is potentially painful, so only the strongest can stay that way.

Yes, I expect this has a lot do with Ra's assertion that it's just as challenging to polarize 51%+ as 95%-.   Both require much dedication and courage.  Both are very deeply felt. And the need for such depth of character goes some ways towards answering the question posed in the title of this thread, I would say.