This is likely the case.
Let the victims see every detail on the perpetrator's last days. Why hide?
Let the victims see every detail on the Mandalay Bay's operation. Why hide?
Let the victims understand the measures that will be taken by the hotel and security in the future to prevent similar massacres.
Every outdoor gathering is a potential killing field.
We need to understand that this event is being used to the benefit of future events. Much like lighted exit signs became part of building codes around the country.