Lazy People of Society.

So, I'm wondering why people are so lazy.  I mean seriously how does some one walk around the entire store and just decided at check out hey i don't want this shit, and then they leave it in front of the cashier like next to the gum.  Seriously, epic fail.  But then again there's also people who leave Tim Hortons or Starbucks coffee cups right in the aisles on shelves.  Why?  Are you all of a sudden to lazy to throw it out?  Like, I just saw this at Walmart, and I would complain saying it's just Walmart people, but I work at Target, and people are that lazy there too.