The way I run it, during character creation players choose an alignment for your character. This must jibe with the character background - as it explains how the character HAS acted. Most of the time, the PCs will continue to act in this way, since it fits their character concept. If their pattern of behavior changes, so does the sliding scale of alignment. One or two minor acts, no big deal. A demonstration of habitual acts, however, can alter the alignment "stat".
It's the "stat" that matters for things like Holy Smite, Detect Evil, etc. If someone, even a mere mortal, makes a habit of killing people because he likes it - evil, obviously. This is why most criminals like thieves and con men are CN, not CE - because Evil in the logical way the game works requries intent to do willful harm to others for its own sake. Steal a loaf of bread, it's not because you hate the shopkeeper, it's because you want the bread. It's an unlawful action, but not necessarily an evil one.
This stops paladins from using their abilities as Detect Criminal Tendencies. That'd quickly turn into 'Minority Report' all too easily.
It's the "stat" that matters for things like Holy Smite, Detect Evil, etc. If someone, even a mere mortal, makes a habit of killing people because he likes it - evil, obviously. This is why most criminals like thieves and con men are CN, not CE - because Evil in the logical way the game works requries intent to do willful harm to others for its own sake. Steal a loaf of bread, it's not because you hate the shopkeeper, it's because you want the bread. It's an unlawful action, but not necessarily an evil one.
This stops paladins from using their abilities as Detect Criminal Tendencies. That'd quickly turn into 'Minority Report' all too easily.