DarrkPhoenix: While that set of actions moved your alignment towards both evil and chaotic, unless you did similar things multiple times it wouldn't be enough to prevent you from becoming lawful good through other choices in the game. However, various dialogue choices (a very large source of alignment shifts in the game) may have also shifted your alignment, or just taking more neutral dialogue options may have resulted in you passing up opportunities to shift your alignment towards lawful good. Basically your alignment ends up being a function of many, many decisions, and aside from a few big ones (like murdering or selling into slavery one of your companions) a single decision won't be enough to prevent you from eventually reaching an alignment (as long as enough of your other choices move you towards that alignment).