

It gets messy when people act like God has an active hand in every single little thing that happens. It’s right up there with “everything happens for a reason”. You know, rape happens for a reason. You just don’t know why yet.
I like to frame it as free will & sometimes things just…happen. Accidents happen. Free will principle. Sometimes bad things happen because of bad people, sometimes bad things happen because you’re stupid…it just seems to make more sense than an overly involved god.
I’m going to preface this statement by saying you don’t need to be a believer or religious to benefit from religious things, or musings of religious people. Your questions relate to philosophy, morality, virtue. These are things religions have pondered for centuries. Millenia. Perhaps we should at least consider what they have to say. I’m also going to preface this with…I think I misinterpreted your first question. But I like what I whipped up & I think you will, too, so I’m keeping it. 🙂
Pope Saint John Paul II once said, “freedom consists not in doing what we like, but in having the right to do what we ought.” Now I really like this definition because it implies that real, lasting, quality freedom of the individual still comes with some responsibilities & even obligations. In the same way “being nice” is multi-faceted, it’s got layers to it, it’s using your freedom, abilities, powers, & assets to do good things for others. To build others up.
Now on to what I think your questions are, but I’m going to answer in reverse because I think it flows better in convo: there are absolutely huge differences between acting nice & actually being nice. A big one is motivation. Are you nice to help others? Or are you being nice in a bid to gain favor, look good, or get something for yourself? Are you altruistic & trying to help others? Or are you just in it for yourself? In Rick & Morty, I liked the wedding toast where Rick says being nice is something stupid people do to hedge their bets. Some people are nice just to help themselves.
We all have an opportunity to become better, or “be good”, and it doesn’t have to be anything earth-shattering. It’s the cumulative effect of making good choices, the right choices, every single day when we’re presented with the opportunity. Will Durant, when summarizing Aristotle’s philosophy, remarked, “We are what we repeatedly do. Excellence, then, is not an act, but a habit.”
It’s hard to define “a point where someone stops being nice”; I don’t view humans as one-dimensional. It’s got to exist somewhere. I go back to a person’s focus & intention, some people are “not nice” on purpose & then I’m sure there are lots of people with glaring character flaws, who are themselves unaware and/or they don’t personally view those characteristics as flaws. “Being nice”, itself, is open to interpretation. Personally, I would define being nice (to others) as seeking out & prioritizing their needs, especially without obligation or compulsion. Maybe a person stops being nice when the bad is significant, or outweighs the good. Honestly this probably plays like the guy presented in comic, but I think different people can have different relationships with the same person. There’s a difference between a man & his boss, a man & his guy friends, a man & his wife, a man & his children, a man & idk people he doesn’t like. It’s the same guy. I think how a man treats somebody he owes nothing to says a lot about “niceness” & character.