Fictional Bad Guys Are Implausibly Lousy Shots

One really annoying thing in many action or science fiction movies or TV series is that the bad guys are always really lousy shots, at least when fighting the main characters. The most famous example of this was how, even after Obi-Wan Kenobi in the first Star Wars-movie ( Episode IV: A New Hope) said "these blast points are too accurate for Sand People. Only Imperial Storm Troopers are so precise", the storm troopers were consistently unable to ever hit Leia, Luke, Han Solo or Chewbacca even though they had the chance repeated times often just from a 10 meter range or so.

Here is the Family Guy parody of this phenonenom.


And here is an example of what's parodied, at 1:54 to 2:12 in the clip. Here we have several elite mercenaries, shooting at Bruce Willis' character from a distance of just a few meters/yards with sub machine guns for a time period of 18 seconds, and they all miss! It's almost as if the makers of this movie wanted this scene to be a parody.