This is deep yet a general happening all around us. I never thought of it this way though, I just felt the activities of good that the people who do bad carry on is just to cover up their tracks making it quite difficult for them to be captured (a smart move from a smart bad person) like in the movies both reality and fictional where serial killers can be the nicest of individuals in the neighborhood yet carry out heinous acts with no iota of remorse or regret. Hence, terming them sick in the head (psychopath).

What do I know?

For me, though we are weak and we fall sometimes, what counts one as good is by their effort. You fall and feel remorseful about it then make the effort to not fall in that way again - you are good enough. No one can really be good.