Well, it's all part of the LCC lore (check it out on CC if you care to), which happens in a society where magic is very feared and shunned. As for what it's actually used for, and if the persecution is righteous or not, that's (apart from the background lore and leader-hosted contests like this one) completely up to the members of the Outlaw faction, which also includes magical creatures and wizards. The whole idea is, as said, a part of the longer story of Roawia (the world of the LCC) and past events and wars that have caused the populace to distrust any kind of magic. I've personally chosen to play the LCC as quite the enemy of supernatural things, but I really like that you take your time to evaluate the different sides of the war.