[quote=@Gowi]
<Snipped quote>

Chaotic Good does Good at any cost, any end, any means. The law is irrelevant in the eyes of good. In this definition Punisher could def. be CG.
[/quote]

Depends on whether you're more Kantian or moral absolutist. If you believe killing -- regardless of the intention -- to be an evil act, then Punisher cannot be Good.