Sorry for posting here coz' im not involved in this situation. Just want to give my take on this.
I was on the same match and saw what happened and the reaction of the players. He was being chased by couple of hunters, smoker and tank (forgot other SI's). Most of all, He was Alone. Do you think he would've reached the saferoom with all those SI's chasing him? I bet if he didn't suicide, he would not have cleared even 10 feet. What good did it made if he didn't suicide? Some SI had surely killed him. That's it. It's the same thing, he dies either way. There's no HUGE impact on the game/round.
Also for the "griefing" rule, I would've agree on the ban IF he was with someone, both rushing towards the saferoom, and he alone suicided, his companion would've left alone. But that's not the case here.
Im not saying that the rules doesn't matter, but it also depends on the situation.
P.S. Feel free to ignore this post if it didn't made any sense.