You can't prevent all crimes.
However, better policing and improved government code/zoning enforcement is the solution to decrease the probability of said crimes happening and certain businesses from opening in the future, not shutting down established taxpaying businesses because one doesn't like their model or the type of clientale they attract.
A big city's downtown like Detroit's SHOULD consists of residential, commercial and even industrial places that serves people from all sorts of backgrounds, as diversity is part of what makes an urban environment attractive.
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