the govt cannot force you to stay in your home or flee your home in cases of emergency.
in such a situation you will likely be questioned as to what your doing and asked to return home to help reduce the ammount of people being put in danger. but they cannot force you. they CAN keep you out of an active crime scene or arrest you for interfering with police investigation if your wanderings lead you into a conflict with what the police are doing searching for a suspect like that.
if your intent is to strap a camera to your chest and be beligerant and insist on being an @ss walking up and down the sidewalk in front of a place that is thought o be habited by a mass murderer, your going to jail and im going to laugh at you for being stupid and making it harder to catch the perp.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent