Rights going down the drain.
And their justification for doing it is pretty much just the honor system. "Oh don't worry, we killed these guys. Trust us, they were bad guys. Of course we can't show you any of the evidence against them, because that would be a national security breach, but trust us, they were bad guys."
The United States government definitively says it can kill its citizens if it's too inconvenient to arrest them and try them. That's the bottom line. If you think your government, no matter who is in the White House, should have that power, then you really don't care about your rights.