"Where are the club owners doing prison time?"
They have not yet been tried. Obviously their guilt is much greater than this man's. I suppose this sentence is just, he did not mean to harm anyone.
The owners however, they could be put away forever as far as I'm concerned. Anyone who locks a fire exit, for whatever reason, is responsible for anything bad that happens as a result of that. If you don't want folks sneaking in the exits hire a security person, if you can't afford to do that, get out of the business.
Big darned ditto to that, j.