When my minions have all died, I will not rush out to meet my foes in melee range. I will instead cast my spells from afar, raining death and candy from above.
If the adventuring party at my doorstep is being payed to kill me, pay them more to not kill me. Not everyone is lawful good.
The given alignment of any random adventurer quickly approaches True Neutral the more platinum you offer them. I suspect this to hold true for all races, and most classes. Expect paladins. Damn Paladins.