The books are a good read. I liked all three of them.
The movies are actually quite good too. All four of them.

One dead is terrible. 100 dead is a tragedy. 1000 dead is a statistic.

Maybe that’s how our brain just works for an evolutionary reason.
Groups of apes are at 50-60 max. because there’s no time left for grooming all group members.
Groups of Stone Age humans could grow to 120 because gossip could function as a auditive way of grooming.

After writing developed human groups could grow to thousands and thousands. Yet it would be impossible to ‘groom’ all of them. Even through gossip.

So maybe it’s just where our brain stops … we can’t grieve six million Jews, two million Armenians, millions upon millions in poverty.
Our brain has got no neural functions to have such feelings because throughout our evolution we didn’t need it.