Batman: The Ultimate Evil part 1

I didn't read the Andrew H Vachss novel, maybe I should? I got both part 1 and 2 for $5 at a discount bin.

In this story Batman seems so shocked about all things leading to child abuse. How is he shocked about this? It seems far fetched that a vigilante would be ignorant when it comes to child abuse. I will be reading volume 2 since I have it. The artwork isn't the greatest.