Why is Ivanka helping Trump to "do the right thing" terrible ? ? ?

You have a keen eye to have noticed that unintended ambiguity. He means that Nordstrom was terrible, but I thought exactly the same thing (that he was criticizing his daughter). I'd be reluctant to insult the average 8 year old since, rather than thought, I sense his tweeting is impulsive, but your point is well taken.

That's her father.

In corny English films of the 1930s, the villain would be unmasked and told how badly he'd let the side down. He would be left in an office and told that there was a gun in the desk drawer and told that he was expected to "do the decent thing". Pan to the outside of the office door and there's a gunshot.

If only, Donald, if only.