As many people have chronicled, the decision to fight in Vietnam was a years-long accretion of step-by-step choices, each of which could be rationalized at the time. Invading Iraq was an unforced, unnecessary decision to risk everything on a 'war of choice' whose costs we are still paying.
I began revolution with 82 men. If I had to do it again, I do it with 10 or 15 and absolute faith. It does not matter how small you are if you have faith and plan of action.