That stuff is mostly for show.

Real goodies shouldn't (and if I'm not mistaken, in the case of Fort can't) use stuff with an evil aura. Paladins can remove it. An evil probably wouldn't let such petty details as a goodly aura bother them, if they were able to use the gear in the first place.

Darkness does nothing afaik.

Blessings have nothing to do with a goodly entity, since evil and neutral healers can toss those out just fine. IIRC healers and paladins can wield only blessed weapons.