View from Mars (http://mars.jpl.nasa.gov)
There are a thousand reasons why Space X would never work.
There are a thousand reasons why Mars Curiosity would fail.
There are a thousand logical, rational, and completely correct reasons to not do anything at all.
Problems. Holes. Issues. Edge cases. A thousand of them. Everyday.
But seeing problems is for beginners. That's where most people stop.
To make great things, you must go beyond the reasons for why it won't work.
You must find the way to make it work. Find the reasons for why it must be done.
Do this and the problems fall away. They become smaller. Solvable. No reason to stop.
There are a thousand reasons why your thing won't work.
So do it anyway.
Launch rockets like Musk. Send a rover to Mars.
Do the things that cannot be done.