ok for starters WTF legion slaves people crusifies them and murders tons of innocent civilions(nipton not to mention) also the NCR does not do everything for the wrong reasons have you seen the legion ending in New vegas its [censored] terrible the ncrs is way better and way less people die because of it
They crucify those that don't obey, are corrupt. Nipton was an example, it was a hub of crime.
I don't judge them for the endings of the Mojave, for the entire US the Legion would be better suited, the NCR would just cause a SECOND great war.
The NCR are corrupt, evil and just plain dumb with tactics.
The only reason they want the Mojave is to expand, anyone they don't want dies.
The Legion wants the Mojave for them to have a Rome, to spread civilization.
EDIT: That's not dumb, that sounds intresting.