By definition treating everyone exactly the same is fairness.
I suspect other people have different definitions of "fairness". And most of them don't think of equality under the law as fairness. Our Constitution promises equal protection under the law. That doesn't guarantee fairness.
Life isn't fair, it never was and it never will be.
but laws can be
Well, there's a conflict between difference conceptions of "equal" and "fair".
Liberals focus on outcomes - to wit:
The crates here are "the law". If everyone is treated equally by the law, they will experience different results. Some people think this isn't fair, so they want the law to compensate, by treating people
unequally.
The point here is that equal protection of the law (which is guaranteed by the Constitution) isn't necessarily "fair". And, if we task government with the job of making things "fair", equal protection of the law will be sacrificed.