Alignments of the stick

[SowZ]

One hour of evil acts does not make you temporarily evil. It just shifts your alignment slowly toward evil and MIGHT change it, permanently (Or until good acts shift you back to neutral).
That's how the alignment system works in D&D.

Acts of extreme evil, (hint: unjustly slaughtering hundreds of sentient beings including dragons, centaurs, etc. not for any good reason but for the explicit purpose of torture, and enjoying every death,) can push an alignment completely over.

What about Soon Kim, Girard Draketooth, Serini, all those guys? I don't think there is much point talking about all the characters Roy met in the LG afterlife...