That's the point. You are not being objective. According to your logic, we should have all these deranged dictators around the world wreak havoc in their own countries and neighbors because, alas, we should not get involved in other 'people's lives. Every single time humanity has shown weakness to evil doers in powerful positions, the price we have had to pay has been much bigger than if we, collectively, had dealt with the issue close to its inception. America needs to remain the most powerful nation in the world militarily because if not, other countries would too just too happy to take its place. That is the way civilization has worked for millennia and will work the foreseeable future, regardless of your 'strong conviction'.