Kill the Boss!

   I was thinking over the weekend about how a large portion of my sons' recreation (especially now that it's cold outside) involves video games. The love them- the innocent stuff like Mario, Kirby, etc. However- most of these games consist of the same goal:
Kill the boss! Not only is that what they're trying to do- but they talk about it a lot in "regular play-time" also.  Beat the boss! Kill the boss! Show the boss who's boss! My only concern is- how will this affect their work ethic later in life...as say their first job at a restaurant, etc?