I prefer to think of them as 2 Rogue Brothers killing for fun...
the "food" was just another reason for them to indulge in it.
It could also be seen as Nature pushing back against the
world of man.
But then...I've been accused of thinking too "deeply" about
these kinds of incidents.
I remember reading recently that one of the lion's had an infection in the root of a tooth which made it difficult to hunt and therefore may have attacked humans while sleeping because it was easier to do. What truth there is to that I don't know.
I did see the lions at the Field Museum more than once. Something very freaky about them.,