Is the job of Law Enforcement to investigate / prevent violations of the law or it is it to investigate abnormal people? Should police be able to stop and contact anyone for displaying abnormal behavior or should they need reasonable suspicion that a violation of the law has been committed?
Don't act like a weirdo and people won't treat you like a weirdo.
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If there's nothing wrong with having to show an ID to buy a gun, there's nothing wrong with having to show an ID to vote.