DarkMaster said:
Sorry state of mind is not the appropriate description, It is much deeper it's the value you are basing your life, what is deep inside, your philosophy toward your existence and the existence of others. These are things that cannot be changed easily, it either takes a lot of time or an enormous emotional shock, losing a child for example can reshape your vision of the world for a few years and slowly come back or not. I know that if I would lose my 15 months son it could seriously change my vision of the world. Action have nothing to do with alignement, they are just the results of your tought. If I am a good person I will never kill intentionally because my conscience tell me not to. My action are not driving my mind, it's the opposite. Action more often than we want will actually do the opposite of our intention.
Yet there have been many good people who have killed in a moment of rage. If they were truly good, deep inside, in the part that matters most, how could this be? You could say that they were really, secretly evil, but I believe this is a simplification at best. Circumstances alter cases, and bad situations can drive good people to behave in extreme ways.
A perfectly good person can be driven to do an evil thing. This, I think, is a crucial point - if you can accept it, you should be able to see why basing alignment on a person's innermost being will not work, for if it were based on that, if in fact someone's innermost being can be so quantified, then it should not be possible for a good person to do something evil. Alignment must be based on something else - like action. Our innermost selves are beyond such classifications.
As for the serial killer, he killed in the past, but since he talk with the paladin he is "brainwashed" Now, In his mind killing a inocent child for pleasure is unconcivable, therefore his alignement is changed. You are probably catholic, you think that you must buy your paradise with good action. Catholic churches (notice that I say church and not religion) focus more on the actions than the interior. Because it is the only way for priest to judge if you are good or evil. I expect a fantasy church to be less oriented towards the action and more towards the inside since they can actually see the real intention of their follower(Detect alignement spell).
Atheist, actually. Now, what if that serial killer walked out with the full intention of turning his life around, saw an innocent child, and immediately succumbed to old impulses? Was he, then, ever truly good? Why? Yes, he intended to change his life, and he felt certain that acting in such a heinous way was behind him - but what use, and of what true meaning, are such intentions if they are not backed up by action? Is a good person actually good if they never help anyone in any way?