>>Personally, a society with two sets of laws (or who knows, if Sharia caught on, how many others would want their own set of laws) is not a society in which I'd want to live.
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>Not defending sharia, but you live in a society with 3 sets of laws. Federal, provinical and municiple.

But they don't conflict. Essentially, they are really one set of laws regulated by different levels in our hierarchy. We don't have federal traffic laws, for example (that I'm aware of).
With Sharia, we would have 2 sets of laws covering the same activities.