[You think it's good to slaughter men whose religious beliefs differ from yours?]

It can be, if their beliefs are, for example, unrepentant Nazism or Islamofascism. As for killing their children, even that may be morally defensible. I know your reaction will be "you have GOT to be kidding," but I am not. More on that later, this is way too long. Note that the Isrealites were never ordered to rape.

Needless to say, the bible balances justice with mercy. I dare say we are sometimes too squeamish for what justice requires.