Why wouldn't they pursue the Waco shootout unless the gangs are full of undercovers or offduties (like the motorcycle gangs here in NYC).
So most people don't realize that
Mandalay Bay - Wikipedia
Five floors (floors 35-39) of the main hotel building are occupied by the five-star and AAA Five-Diamond Four Seasons Hotel Las Vegas.
and the owners are
Since 2007, Bill Gates and Saudi Prince Al-Waleed bin Talal have been majority owners of the company
One theory is the reason the door in the hallway was propped open was so the killers could easily escape upstairs to their Saudi handlers. Remember who attacked us on 9/11- Saudis funded by Saudi royals.