That's a silly argument. It sounds like you're pitting natural laws against, well, legal laws, and claiming that one is stronger than the other and thus it is some sort of predestined necessity for DRM to be cracked. There's no relation between the two, and the mathemtical 'laws' aren't laws in the legal sense, they're just descriptions of natural phenomena, not prescriptive behaviors. Claiming that the inherent mathematical crackability of DRM makes it 'physically illegal' not to crack them. It's like saying it's physically illegal for me not to drop a rock on someone's head, because that would break the law of gravity.
Math doesn't crack DRM. People crack DRM.