Who is the Legitimate Author of the Constitution? I wonder if our fascination with questions that don't matter has ever been given serious study. But now I think of it, that may not matter either. — Ciceronianus
Principles are more important than practicality. It sets the standard for our actions.
When you break the principles, be it secular or religious, you get an estimation of how deviant your actions have become. You feel bad when you go so far. Even though you're not following the principles line by line, it's working as a compass. But when there is no principle, you'll have no direction. You'll have no restraint. You'll have nothing to shape your life. Be it personal moral codes or societal. Much like law and order.