The use of the word "intervention" seems like an NBC attempt to influence people's perceptions, as if Trump has some sort of a drug problem. He might for all I know, but intervention seems to be a very loaded word. They keep saying that word, but I don't think anyone associated with an actual meeting is.
Trump has handled the Kahn situation poorly, but I think that here again media like MSNBC are trying to make it seem like he went on the attack. The only thing I've heard that reached that level were Trump's ridiculous comments about his wife.
The purple heart thing was clearly a joke, as was the thing about getting the baby out of the rally. I heard an NBC commentator go on and on about how terrible that was. I thought it was pretty damn funny. Some people hate Trump so much that they are trying to turn everything he says or does into something negative. I think his opponents would be a lot wiser to attack him on his legitimate faults rather than trying to turn jokes into controversies.
Here's a non-NBC source, since you seem to dislike that network:
https://www.bbc.com/news/world-us-canada-36968053
It's all over the news.