"Hillary is calculating, corrupt, and evil."
At that level of American (maybe even non american in some cases) politic pretty much all politician are corrupt and probably having sociopathic tendencies (evil if you prefer).
Alternatively there has been dumb people publishing their attempt on twitter or whatnot. Now , a lone snipper or gunman or bomb maker, which do not publish what they will do beforehand, that would be something else. Especially with drone which can hold enough weight to have a gun or a bomb. Also remember , some people landed and there were drone on the white house zone. Which leads me to think, the secret service might not be that incredible either, but enough to catch the most dumb and less likely to reach their goal.
Of course you can't flap your arms and fly to the moon. After a while you'd run out of air to push against.