Faolyn
(she/her)
Have you actually read their descriptions pre-3e? For instance, from 1e:They haven't ever been objectively evil as a race just because their god made them that way. Starting with 3e, orcs were often CE, which meant that 40-50% were. In 5e the alignment is only a suggestion and the book says the DM can use any alignment he wants for any creature. Eberron orcs are not all evil in 5e. So despite the 5e orc fluff, they are not all evil. However, if an orc IS evil, whether through choice or Gruumsh, it is objectively evil.
In 1e and 2e far fewer of them were not evil, but they still existed.
Ditto 2e:
And there's nothing in their description that suggests that this isn't nearly universal. All 2e notes is some humans are as bad as orcs and that orcs prefer game meat over that of sentient beings. "Not cannibals" is not a glowing endorsement.