This is the problem right here. We'll never as a world tackle a large project to get humans to another star system if we don't cooperate. The profit motive is holding us back because there is no profit in it. The only thing that could change that equation is if we found some comet was headed to earth and we had time to plan, but even then I don't think we'd get anything done and just squabble. Here is my article on the Fermi Paradox I wrote last year https://medium.com/predict/how-rare-is-earth-in-the-galaxy-272c6003018b