Here is a possible scenario:
The Triad decided not to stick their necks out, meaning they wouldn't kill. But they had to do something—so they went to loot the casino. They thought Cash owned this lovely establishment. And by all appearances, they were mistaken, because as written in the newspaper, Ulric drank away all his money, which means he became a drunkard.
Added after 33 seconds
I don't understand anything. What stops them from killing and blocking?