"Liberals are so woefully inconsistent in how they criticize Republican presidents . . . for being a warmonger. They're so hopelessly inconsistent." —Joe Rogan
Executing someone without a trial is dangerous. How do we know the person deserved execution unless he had a trial? Jury trials are important. A group of people can listen to the facts and decide whether or not someone is really guilty. Killing someone without a trial is a dangerous precedent. We're supposed to just trust the executioner.
This sort of thing is why the Constitution separated the Judicial and the Executive branches. The Executive is the executor, or executioner. It is not the Judicial, or judge. The executor executes the judgements of the judicial branch, and carries out the rules of the legislative brach. Well, that's how it's supposed to work.
Unfortunately our two-party system has eased everyone into abandoning principle in order to beat the other team. A video by Adam Kokesh filmed this hypocrisy among Obama supporters, who criticized bush for everything he did, but supported Obama for doing the same thing.