How can non-social creatures be lawful?

[Lord Pendragon]

(When I was younger I did agree with the personal code, now that I'm older and perhaps wiser I've begun to believe a society is necessary).

What an odd statement. On its surface, it seems to indicate that you believe the wiser--and therefore correct interpretation is yours, which you've come to realize as you've aged. Thus those of us who are younger--and perhaps not as wise--can of course still have the misguided belief that a society is not necessary to be Lawful.

It's my guess that you probably didn't mean that. But the way you threw in "and perhaps wiser" definitely gave me that impression.

Anyway. I consider myself somewhat wise. Or at least, I don't consider myself particularly unwise, and am a ripe old 29. Not exactly a town elder, but hardly a child, either. And I am firmly of the belief that a society is completely unnecessary in order to be Lawful. It can be relevant. A mind can seek order by marrying itself to the ideals of the society that surrounds it. But it isn't necessary. Another individual might find themselves born among Chaotic barbarians, and yet seek a personal Order their brethren cannot understand. Does that make this person Chaotic, for rebelling against his society? Not IMO. In D&D Law and Chaos are absolutes, defined outside of societal norms, just as Good and Evil are. And as such a unique being who has never encountered any other living soul and lives in complete isolation in a barren universe might still be Lawful.

I also believe Fusangite makes a good point about cosmic "sides."