Poison: Always Evil?

It depends. Think about it: In ancient Greece, the poisonous hemlock was used to kill prisoners sentenced to death (see e.g. Socrates). That's an absolutely lawful use.

Then it's not Veeky Forums

Lawful, not "good".

Killing a bad guy isn't evil, user.

No worse then power word pain to me

but in setting your probably never be considered a Hero if it's know you use it all the time and people will judge you

don't think it's Evil their probably think it's Cowardly, Weak or Dishonorable to use

But magic is Ok.

Because you can't slip a Fireball into someone's drink, walk away, and then have that guy die hours or even days later.

delayed blast fireball, your argument is invalid

So it's more a question of usage.
Poison coated sword is not evil.

>not putting explosive runes in library books

It's like you're not even a wizard.