The welfare of the people should be the highest law of the land.
If it takes a "Brexit" for the ordinary people of Britain to be better of, the so be it.
But if this is just another ploy by wealthy Neo-Liberals to isolate themselves from a larger society that would put the brakes on their tax-and-spend policies, then I hope that it is doomed to failure.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.