Statutes are a lagging (not leading) indicator of consensus about acceptable behavior. Law is evidence to help establish that society, at least at what time, found a certain behavior unacceptable. It also has to be willing to enforce it rigorously and consistently today.

It's good hygeine to repeal or amend laws that we aren't willing to enforce, but it doesn't always happen. If it does happen, it's almost always after, not before, doing what the law prohibits becomes widespread and socially acceptable.

It might be morally necessary to abstain from behaviors your community finds unacceptable. It might also be morally necessary for the executive branch to enforce the laws exactly as written, no matter how poorly they track moral consensus, until the laws are changed.

It doesn't follow that it's morally obligatory to follow the law just because it's the law.