You're leaving out my aesthetic reconstruction of morality. I'm not a nihilist, although I do find many things appalling.

I'm sure many mystics feel optimistic and compassionate towards others. The question I'm raising here is whether the monistic metaphysics they resort to to understand their religious experience justifies altruism.

It's possible that mysticism itself entails an amoral and nihilistic attitude while the moral platitudes follow only from popular culture. So in line with Leo Strauss's analysis, the mystic would be resorting to a dual narrative (exoteric versus esoteric) to fit in and to avoid scaring off the less enlightened.