If they get 30 free throws on touch fouls and flops no team is going to be able to stop them.
They can be beaten. The refs shouldn't have anything to do with it. Personally, I think the refs have a tendency to react to the flow of the game. Once you start to get frustrated, like the Knicks clearly did in this one, things start going against you, including the whistles.
The refs helped, but the Knicks completely unraveled, too. That was the bigger factor in the blowout.
I'm not in the camp that believes that the NBA is akin to pro wrestling. Maybe I'm being naive. I think the refereeing can be lousy at times, but I also think that good teams can rise above the calls and turn the tide of the way a game is being officiated by their play.
The Heat can be beaten by a good, veteran, smart basketball who knows how to get into their heads as opposed to the other way around. I know of at least one such team.