“Saying that Lolth is less evil because the consequences of her actions affect fewer people is like saying that a serial killer is less evil than an embezzler. It's not a valid comparison, simply because Shar is far more powerful than Lolth, and plays on a very different stage.“

I just want to point out that this is actually the invalid comparison.

Kanisatha was comparing orders of magnitude of the same thing (being evil) using a moral Utilitarianism approach. This is quantitative

Comparing the actions of a serial killer to an embezzler is qualitative, as you are now comparing different kinds of evil. It is completely outside the scope of his argument, so it doesn’t function as an analogy.