We see their behavior towards others. Good doesn't equal perfect and most realize this
True benevolence is a hard thing to accomplish. It goes against out nature. I think some people want to be seen as good people so much that they are always vigilant. But I don't believe it comes effortlessly or naturally to anyone.
only someone in a coma lol
Yes there is
But then that poses the question... Who decides what is "good". If every persons perception of it is different in terms of scale and action then even a famous dictator or murderer could be described as good by their supporters. Resorting to defining the world in this binary "good vs bad" form is the reason conflicts exist.