The reason Caesars Legion is so Violent is because they are based on the Roman Legions who had a habit of going around conquering, enslaving, and crucifying and just like the real Legion they won't settle down until they capture New Vegas (Rome) Caesar even explains this. And if NCR is so good and freedom loving then why do they imprison Arcade just for having Enclave armor even though he helped NCR. Also NCR is just as bad when it comes to sending recruits in first but unlike the Legion the NCR basically says "here take this service rifle and plastic armor which won't protect you really but it looks good. Now get out there and try not to get killed because we need to win the dam
to keep our offices...erm i mean to keep the NCR safe yeah thats it". The NCR and Legion both want to add the Mojave and Vegas to their empires but at least the Legion is honest about it.
I don't agree with the Legion's sixism but i bet a future Caesar will sort that out or may be only members of the 1st 12 tribes are actually citizens and the rest are going to be enslaved or conscriped.