Technik4 said:
But how you feel the character should be played is paramount, not the current alignment. In real life people don't question how they generally do things before acting, they act in a manner they wish to. Concepts like honor, duty, loyalty, integrity, etc may make a person do things against their nature, grudgingly. But no one consciously thinks "Well, I consider myself a lawful good person and therefore I should act in this manner". Similarly, no one thinks "Well I'm an engineer, so in this given situation I should act like an engineer." People act the way they've acted their whole lives, and my point is even "lawful" people have bouts of inconsistency.
I agree that everyone has a certain amount of inconsistency in thier behavior, but as for the rest I think you may be trying to generalize your own personal internal conversations (or lack of them) to the rest of the world, and in that you are completely and utterly wrong.
People do think to themselves, "I consider myself a honorable/honest/charitable person, and hense I should do the honorable/honest/charitable thing."
"People can have a natural inclination to be loyal, honorable, honest, and so forth, and not always do 'the right thing' grudgingly, but with gladness.
And people
do think to themselves, "Well, I'm an engineer, so in this situation I should act like an engineer.", because I've had engineers tell me that exact thing. ("X asked me to do such and such but I couldn't, because I'm an engineer and I have to act like one.") Doctor's, accountants, and other professionals with a lot of responcibility (at least the better ones) often have the very same outlook.
As for consistancy and how it relates to alignment, there is a really great quote in Terry Pratchett's 'Thud!':
"The trouble was, the trolls up in the plaza probably weren't bad trolls, and the dwarfs down in the square probably weren't bad dwarfs, either. People who probably weren't bad could kill you."
So I'm in perfect agreement that alignment isn't a straight jacket.
But in my experience often time when that is brought up, the player has a personal or metagame reason for wanting to label thier character some particular alignment, but doesn't really want to play the character in a way that primarily reflects that alignment. The argument that alignment isn't a straightjacket then becomes a weasel argument for allowing you to have the best of both worlds. I have no problem with occassional well considered departures from what is the normal behavior of your character, provided that these don't happen so frequently and so consistantly as to suggest that you've misdescribed your character. "I'm basically a good person, but I murder and steal with the slightest provocation all the time.", doesn't cut it.