No Mischievous Agenda - I Swear!

I would like to write this in permanent ink across my forehead! It's quite ridiculous that employees are programmed to think this way - maybe because they actually do have their own personal negative agenda, but what happened to being a positive member of the team? I don't know about you, but I recall MANY situations throughout school where I was forced to work in teams even though I would have rather wrote my own book summary than count on the student who barely knew his own name. However, I thought that experience was to prepare us for working in teams in our careers as adults. I learned how to handle many different personalities and communication styles - didn't we all? Hell, we learn to share as early as toddler age when our siblings have snacks we want to partake in eating! I have no agenda other than to improve myself and help to create a successful organziation. Why do others have these crazy agendas and believe every employee is out to ruin the careers of their teammates? Are we really all inclined to only look out for ourselves and if so, does that really allow us a leg up on our competition? If this is truly the case, how sad and it is very difficult for someone with my make-up to fully comprehend.