Good as shown in games is generally a fully self absorbed desire to impose your own will to fix what is persumed as a problem in another individual without their consent. Eg: Paladin sees an orc arguing and yelling at a women, assumes the orc is attacking smites him under oath, later learns the orc was the husband and the argument was about where to eat. The above is why good does not exist in games, as the good option would be to close your eyes to the conflict and watch from afar as the orc yells at his wife, and allow events to unfold without imposing your will - this would be seen as a chaotic Evil act in dnd.
The above example although being simple can be seen in virtually all dnd and pathfinder in general, angels and celestial just run around and do stuff on a whim with no rhyme or reason because *we are good*. Demons are actually more good then the good guys as they are free with full meritocracy. Eg: Scothbenoth and Baphomet: allow people to serve them of free will, elevate worthy with power, weapons, fame, homes and treat people fairly. Now compare this to angel Zarial and others: pressure followers to pray consistently, take powers from followers for slightest reason, provide nothing in return, take claim for their victories, highly strict codified leadership, no way to gain power without dying and binding your soul to good loosing your soul, and your memories.
Aka tldr good is probably more evil then evil. Or at minimum could be argued to be the case. So it provides a lot more room to RP and generally makes more sense from a Human perspective
