Rewarded or Punished

So I don't understand why people should be rewarded with OT when they didn't (not couldn't) get their work done. So if I choose to (*^% my day away does that mean I get 3 hours of overtime too? Instead of making sure to balance my time and get the equivalent amount of work (plus running the floor) done with time to spare? and I know its the work that was done was not correct so itll bite him in the arse tomorrow morning but its NOT MY PROBLEM