@Kingwoodnoob :
I am not speaking on 'reasonable' people here, and watching the news, you probably have seen some of the 'less then reasonables', there. It can be Dangerous to approach someone; they may have a weapon, be altered by drugs or alcohol , and therefore, see you as a "threat", and take action, with said weapon. Your 'rights' will have no recourse re a Glock in the hand of an impaired human.
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If you are worried about them, call the NON emergency line to report them, as they are Not doing anything illegal, so they will 'triage' low on the emergency register of police calls.