Of course! Customs and other legal (based on moral) norms are basically the primary source of law or of its interpretation. Human systems based on rigid, or even utopian (that is totalitarian in practice) rules simply cannot handle the complexity of the real world. The system may seem good and functional at first but with the first problem which would because of the nature of complexity and chaotic system dynamics of human interactions inevitably happen, the system would crash (or in this case, get forked) since it would not offer any flexibility.

Without getting too abstract, even traffic lights or zebras, from the perspective of a pedesetrian, (as an example of a simple system) would be a horrendous and extremely time consuming experience if its rules were enforced by the letter. Imagine if you could >only< pass the road accross the zebras...

Human made systems need to be imperfect and the rules need to be flexible or the system will fail.