“Ammo is ammo, so why hasn’t it destroyed him already. (sic)”
Why? Because only Republicans / conservatives / GOP haters / whoever have been voting for him. In other words, this is not the general election. Trump will not be able to win a general election when Hildabeast spends hundreds of millions of dollars (with a complicity media) on playing and replaying all of the foolish things he has said. Remember - BHO got elected - not just once, but twice. Essentially the same voters will put Hildabeast into the White House - with Trump’s political suicide assisting here.
The complicit media ain't what it used to be. Hillary is a horrible candidate who people like less the more they see of her, and the 24 hour social media news cycle is going to make voters very familiar with the beat up old nag. Every hacking cough will be replayed, favorited and retweeted millions of times.
Meanwhile Trump is energetic, witty, spontaneous and fun. Just the kind of guy you'd like to drink a beer with or vote for. He will beat Hillary like a red headed stepchild's rented mule.