Unfortunately, it can also be neither. It's easier to simplify than make it fair.
Your first point is well taken. Your second point isn't. A lot of things aren't easy, and we do them anyways because they're right.
That's a good sound bite, but I don't agree that a simple law must inherently be unfair. In particular, I think that a simple law is likely to achieve greater fairness in a specific area than a complex one, even if neither is perfectly fair for whatever definition of fair.
It is easier to abide by simple, though unfair, law than complicated and arguably fair law.