Ncr, for its, faults is society. Realistically legion apologists just go "but the safe roads though".
If they'd had the time to expand legion, where we could see something besides war camps. I'd hear the argument more.
As it stands, they're rapist slavers who are barely better than raiders.
My favorite playthrough is no faction. They're all corrupt in different ways and I'm the the motherfucking "Mailman" who is subject to none! My chip, my bot army, my strip. Will it last? No. But that's not the point.