Colour in role PMs

[Ircher]

I think Serial Killers are generally colored purple or gray.
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Town = Green

Mafia = Red

2nd Mafia/Werewolves = Orange

Serial Killers = Purple

Neutral Survivors = Gray

[Ircher]

Why not just:

Town = Green

Mafia = Red

Werewolves = Brown

2nd Mafia/Aliens = Orange

Cult = Blue

Self-Aligned 3rd Parties (i.e.: win by themselves) = Purple

Neutral-Aligned 3rd Parties (i.e.: can win with other primary factions) = Gray