A conscience really is a goddamn hindrance in this world rather than a net positive.

Sort of. People without a conscience and without the power, privilege and/or social tools to abuse that often also end up pretty badly. Like how narcissism can lead both to (unwanted) social isolation, or even prison time, and then also sometimes to a successful business/political career or creating your own adoring cult, depending on other factors, both intrinsic and extrinsic to the person.