Really, well lets see, if I sympathize with their plight then I'm basically saying, there but for the grace of God their go I; but if I empathize with them then maybe I'll say whatever happens to the least of me happens to me.
Empathising with an entire planet's worth of problems is basically meaningless. You can't know enough about the myriad situations, nor can you have experienced enough of them to truly 'empathise'. If you did truly empathise with them, you'd call up into a little ball in the corner.
Our minds don't work that way. What you see as 'callousness' is also a protective behaviour.
Still, feel free to judge anyone who has the temerity to say 'sorry for your loss'. I'm sure it's completely impossible that they're as empathetic as you are.