"I wish I could just rob that bank, but what can I do Hashem told me not to"
"I am ready to kill him with my bare hands but the Torah doesn't let"
Do you not differentiate between chukim and mishpatim?
Of course there's a differentiation, that's implicit in there being different categories. The foundation for why we do it, or as he puts it, the foundation for Torah-based morality is G-d, not our rationalizing.
Morality based on human rationalizing is *exactly* how you end up justifying LGTBQ, euthanasia, infanticide, or any of the current political hot potatoes.