Right effort suggests abandoning such thoughts, of course, but remorse is not helpful and can be set aside. Also, disgust and whatnot may be useful for some, but equanimity and disenchantment are perhaps better, or at least potentially less problematic.
"And how is it, bhikkhus, that by protecting oneself one protects others? By the pursuit, development, and cultivation of the four establishments of mindfulness. It is in such a way that by protecting oneself one protects others.- Sedaka Sutta [SN 47.19]
"And how is it, bhikkhus, that by protecting others one protects oneself? By patience, harmlessness, goodwill, and sympathy. It is in such a way that by protecting others one protects oneself.