I mean, if the Supreme Court says it's the law, then by definition it's "the law according to the Supreme Court". Likewise, if my friend Doug says that speeding

I mean, if the Supreme Court says it's the law, then by definition it's "the law according to the Supreme Court". Likewise, if my friend Doug says that speeding is fine because he's a sovereign citizen, then that's by definition "the law according to Doug". The difference here is that we determined a few centuries ago that the Supreme Court's interpretation is the one that counts, so we abide by that interpretation when trying to figure out what laws mean.