I must agree. If somebody threw a drink on you after you were already riled up you think you would be able to contain your anger? he's a human and he gets pissed a lot.
There is no way he should be kicked out of the league. As soft as the NBA already seems with all the flopping, kicking someone out for an elbow(yes I understand it's a repeat offence) would make the NBA a bunch of pussies even more.
However, I must say I am a Harden fan and am not happy about seeing him hurt.