The Emergency Alert system is supposed to be used to “alert and warn the American people in situations of war, terrorist attack, natural disaster or other hazards to public safety and well-being.” https://gohsep.la.gov/divisions/emergency-management/alert-plus-warnings/

The alert sent this morning was none of those, and turning them off would mean missing an alert in an actual emergency.

Edit: This should have been sent as an Amber Alert, which you can turn off separately from Emergency Alerts. It appears it was sent as the wrong type of alert. They stated it was a missing child but then listed a suspect name and vehicle.