Considering the horrific things Castro did to the Cuban people[1] and how he almost started nuclear armageddon[2], the world would have been better off if he had been overthrown (and possibly killed) as early as possible.
> Is the US government the best judge to decide who lives and who dies?
No, and nobody in this thread is arguing that. The US military is an extremely flawed organization, and any military is a blunt tool. Even when the US goes into a country with the best intentions (a rare occurrence), lots of innocent people will be killed. It's good that we continually raise the standards we hold our military to. It wasn't that long ago that people were fine with carpet bombing population centers. Now we recognize that such acts are abhorrent. The same is not true for other governments and leaders. So to answer your question: I don't think the US government is the best judge, but it's a lot better than the alternatives (such as the PRC or Russia). It's also a better judge than the people it tries to kill, such as Osama bin Laden, Saddam Hussein, Abu Bakr al-Baghdadi, and Ayman al-Zawahiri.
1. https://en.wikipedia.org/wiki/Human_rights_in_Cuba
2. https://www.nytimes.com/2012/10/26/opinion/how-castro-held-t...