I'm not sure I get this one. Is she saying that evil is the lazy way out? That people have to choose to be good, that evil is the default?

maybe she's saying that fence sitting is the ultimate evil.

I interpret it as causing those results 'by accident', not intentional, a by-product of another, perhaps unrelated reaction. IOW lack of consideration for somebody/something else.

An example perhaps decimation of an old growth forest for building material. Short-sighted, greedy? It ends up negatively, but nobody did it to purposely ruin one.

To paraphrase several quotable people....

Do not attribute to villainy what might well be attributed to mere stupidity