[General] MEN ON MARS, the story of Curiosity's odd shadow

This has appeared on my Facebook news feed a few times and it's disappointing that people believe it.  Anyway, people claim the Curiosity rover is either on earth or there are people on Mars, since this photo taken by Curiosity itself, accidentally reveals the shadow of a person maintaining it:

Shadow of a man?

NASA Source

Popular news articles:

• http://www.dailymail.co.uk/news/article-2925341/Life-Mars-New-NASA-photo-shows-workman-fixing-space-Rover-Red-Planet-conspiracy-theorists-claim.html
• http://www.huffingtonpost.com/2015/01/27/mars-rover-shadow-photo_n_6552762.html

Wikipedia article on the Curiosity Rover:

• http://en.wikipedia.org/wiki/Curiosity_%28rover%29

Image of the whole rover (on earth):

Full size

Shadow of the rover's mast head and the arm:

Another:

NASA source

"Shadow of a man" again for comparison:

NASA Source

So, you can still see the "arm" and the "oxygen tank" and the "head" but it doesn't look so much like a person anymore, does it?  Why are people blindly reporting and believing this?