It's hard not to sympathize with the Pacers' players on this one. Anyone who does what these fans did deserves to be slugged. The shame of it is they'll probably sue the NBA and garner a boodle. Anything these jerks win through litigation ought to be assessed in fines for behavior beneath contempt.
The video can be seen here.
We also fault the league for allowing beer to be sold at these events. The combination of moronic fans and alcohol is highly combustible and the result of that combustion has never in history exalted the human species.
The NBA, like MLB and the NFL, only allows the sale of beer because it's a cash cow, so it's as hard to work up sympathy for their tarnished image as it is for the cretins who threw the beer.