This is RAW.
Not an arguement but a fact. But it also detects undead (even good ones).
I know him well enough to know his answers:
"Fact," he would scoff. "That's your
interpretation. Just because you say it's fact, doesn't make it so." (even though, probably 99.99% of us agree with you)
"The spell makes it clear that you detect evil
auras. Show me in the rules where it says a person of evil alignment gives off an evil aura. Only for people like evil clerics does it say they have an aura of evil."
"But wait," you might say, "why does the table have
evil creatures."
"Because," he would respond, "it's a catch-all. The writers knew they couldn't cover every creature, or potential creature. So, there are creatures who are neither undead, outsiders, clerics, nor items/spells that have given themselves over to evil and would show up as such. Like the blackguard, or a non-cleric PC who is in service to an evil deity and is tainted with an evil aura."
See, you really can't say it's a fact.
What? they list cleric and evil outsiders seperate from Alignment for a reason.
"Show me," he would respond, "where it says 'alignment' in the spell. Oh, look," he might add, "why do they specifically say alignment when talking about good clerics but never say the word elsewhere."
BTW, just a nitpicky point, but your link was to the d20SRD, not SRD. Those are two different systems, technically.
Silly, but does let DM make 1/2 town evil for being jerks (not just for evil acts).
Well, most DMs (myself included) I've seen rule intent as toward the caster/detector, or an overtly evil act (like murder). Small evil acts, like cheating at cards or on your wife, they ignore.
Not RAW but okay.
Again not RAW, but admitting it.
Hence the "Non-RAW" tag.
Speaking of which, I forgot a big one:
Non-RAW:
Argument 6: "I pretty much limit it to really evil creatures because I like my PC's to roleplay what they want. Having DE go off all the time limits their abilities to do 'stuff'."