Artest punched the wrong guy to start with. One of the SportsCenter game-side reporters saw the who threw it, and he said on tv for SportsCenter that the guy who threw the cup was the one to the left (when watching on tv) of the guy in the black shirt jumping up and down. He was wearing the white hat and initially tried pulling Artest off of the guy, but a few minutes into the scuffle lobbed a couple punches from behind. The first guy who got punched didnt appear to be doing anything but pointing out the fact that the cup hit Artest. Nothing more. I'd love to see him file criminal Assault charges, and/or a hefty law suit against Artest (dont really want to see the entire team sued since some of them tried to help break it up, and im sure Artest has plenty of money himself).
The guy on court that got hammered didnt appear to do anything physically. Although he had no right to be on the court, unless he claims it was to avoid the melee in the crowd and he was on one of the first few rows, he didnt deserve to get punched by two different players (the second of which had a running start, which although was horribly wrong, was damn funny).
In baseball, take Red Sox/Yankees rivalry. Who knows how many fights those teams have gotten into on the field where both benches cleared. Yet even when various items were thrown onto the field, players never attempted to enter the stands. As professional athletes, those NBA players should realize they will always have people talking to junk to them. It's part of the game. It's no excuse to start a fight. Sure Artest got hit with a cup. But had he remained clamed and civilized, one fan would have been arrested (no pun intended) and the game probably would have resumed. Instead, it turned into one huge disgrace.