During the many centuries that magic, here on this planet, was presumed to have worked, there were at least as many theories as to how magic worked as there were cultures and religions.
Yeah, I think the common denominator - and this is probably going to sound like Acting 101 - but the common denominator is belief in the character in the moment.
A country's adhering to the rule of law does not mean that its citizens will not do bad things.

