There's nothing altruistic about being honest and keeping your word. It's virtuous, and tends to earn peoples' respect, but it can be cruel just as often as it's kind.
A neutral good person typically wouldn't mind lying to spare someone's feelings, or withholding painful information. Though normal people do have compunctions about lying...
A chaotic good person might not have those compunctions, and would help as much as they could get away with. Probably enjoying the deception for its own sake, unless/until harm unintentionally results.
Meanwhile a lawful good person would gently inform the person of the bad news, and comfort them with earnestness. There are benefits to having a code of honesty and honor, in that people believe the things you are able to say.
These are just examples of course. Not every chaotic character loves dishonesty and lawful characters can certainly lie. Because characters are more than just manifestations of their alignments. Outsiders on the other hand... Well the source material is inconsistent, but in our group an angel who falls literally becomes a devil. They're the same race, after all.
In my opinion good-neutral-evil is selfless-selfish-sadistic. Chaotic characters value freedom and change for their own sake, and lawful characters seek to uphold tradition and stable power structures for their own sake. Most commoners are neutral, meaning they work primarily for themselves and cooperate with society in a normal way. Taking a strong alignment stance would make it harder to get by in normal society, and probably result in the person becoming an outlaw, soldier, priest, or hermit eventually.
True neutral is very different from commoner-neutral. True neutral is a bit alien from a human perspective, because it's the morality of nature. Excesses of any of the four alignments are against nature, which is why druids in general go on about "the balance" and in some cases cases work to subvert places that are "too good" or "too evil". Too far away from natural, neutral behavior. It's pretty weird, particularly considering that druids are allowed one alignment themselves. I think a lot of people just make them luddites who resist civilization. When actually, civilizations are neutral by default... Druids are resisting the planar forces which pull humanity in the four directions. Get lost, angels! Not interested, devils! Stop messing with us, fae! The material plane is for neutral nature, which is also fundamentally human nature. Compassion but not asceticism, community but not slavery.
Whereas regular neutral is more "Man, I don't even have an opinion. I just want to get paid, and eventually settle down with 2.5 kids. Which I guess means saving the world first, SIGH."