You're absolutely right, Mike, about the callousness -- if you look at JW beliefs objectively. The problem is that JWs usually don't look at their beliefs this way. They've largely compartmentalized their minds and emotions in a way that does not allow them to understand the full force of their beliefs. Many will be horrified at a specific tragedy, and some will even help non-JWs when tragedy strikes. But when they 'think' about Armageddon and such, it's like they're thinking about a fairy tale. They don't truly understand that the death of 6 billion people tomorrow is a million times worse than what happened yesterday at the WTC. They simply can't allow themselves to understand it, since if they did they'd be horrified at their own beliefs. This kind of potential cognitive dissonance sometimes gets a JW to thinking, and sometimes causes them to quit.
JWs as well as plenty of others suffer from this mental/emotional compartmentalization. It's so automatic that they don't even realize they're doing it even in rather obvious ways. Some years ago my then-wife (a rabidly braindead JW) and I watched a TV movie where the main female character fell in love with another man, let her emotions run away, dumped her first husband who until then she was very much in love with, and ran off with the 2nd guy. The story was extremely sympathetic towards the woman, portraying her as a very nice person who fell victim, if you will, to her emotions. My then-wife was sympathetic toward the character, even crying at times when the character got into trouble for running off with another man. At the end of movie I was bit disgusted by her hypocrisy and decided to give her a bit of a challenge with a tongue-in-cheek question. I said, "You're crying about the just desserts this adulterous woman received for committing adultery? That's a slap in the face of Jehovah your God!" I thought she'd kind of laugh it off, but she immediately burst out crying and ran to our bedroom. She wouldn't talk about it at all.
I think that most JWs don't think about real-life situations in terms of their religious beliefs, unless they've jumped into that other mental compartment. Just as a rabid JW can forget for awhile how strongly her religion condemns adultery, even to the point of being sympathetic to an adulterer, so can they be empathetic towards everyday human tragedy and yet, in that other mental compartment, rejoice at the prospect of the death of six billion people.
AlanF