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
I disagree with every single part of this post, including the line: "at minimum could be [reasonably] argued to be the case."
Good is about being selfless. If a Paladin sees an orc arguing and yelling at a woman, the Good option is to step in any try to mediate, not necessarily immediately murder the Orc. Alternately, an equally Good option is to wait and see if said woman actually needs help: i.e., if the situation advances to violence. Lawful Good isn't the same as Stupid Good or Lawful Stupid. (Or a CN murerhobo who masquerades as LG)
A character that closes their eyes to the conflict and walks past would be closer to neutral than evil. A "doesn't concern me" type of attitude.
A character that watches from afar and still doesn't intervene after the situation comes to violence would be Evil (most likely NE or CE, depending on how much joy they take in watching).
Demons are certainly not more Good than "Good Guys." You're equation Freedom/Chaos with Good. Freedom and Good often overlap, yes, but they're not one and the same. A society where everyone is "Free" to kill whoever they want isn't a Good society. What you're leaving out is that Demons punish/torture/enslave those *not* worthy of power, and often kill rivals who have similar levels of power or might become a threat.
As for your whole section on celestials, even if some celestials might do some of these things (the more Lawful types), that doesn't mean all or even most celestials act this way. Source needed that this is how Good celestial beings typically act. Especially the "take powers...for slightest reason, provide nothing in return." And again, your statement on "highly strict codified leadership" is equating Lawful with Evil, when in reality these are on two separate axes.
