I happen to be really good at it until the sun goes down and I'm alone with my thoughts. In those quiet moments, the self-delusion fades and then I am remorseful.
I do and have engage d in what many would considerable "reprehensible" and yes I have justified some of it both to myself and others. Some things I have been unable to justify so leave them alone. A lot I see as not justification but simply accepting my weaknesses.