I'm part of society. I know that it is no longer the year 1650. Celebrations of Life are a thing now. I can show you memorial pictures of people laughing, joking, celebrating, dancing, showing peace signs and giving each other high fives. Again, who exactly is giving this rule that it is inappropriate to celebrate at cemeteries or memorials?
When someone was murdered and their family is there. I'm sure if your mother died and someone gave a thumbs up at their grave while posing with you, you'd find it disrespectful. Or maybe not if you have no love for your mom. But yes, generallys peaking, thumbs up to Dead Soldier graves is considered bad in American society. Especially when given the context of "We want to remember how they were taken from us by terrorists."
This can be avoided by being able to read the room.
Trump doesn't read the room, he makes sure he only goes into rooms he controls.
Trump basically told the Army that he is above their rules.
In the area of US free speech, he is. The US Army can't tell me what political commentary I can't make on Twitter, for example. The restrictions of the kinds of activities they allow on their grounds doesn't extend to what I write in my home.
Sure. But that's not the issue. The issue is the filming. Trump can say whatever he wants on Twitter, but he can't film political ads on Army property. Had he no film or photo crew, it wouldn't be an issue. But for some reason, he felt it was important to make his visit public and in an ad... Why do you think that is?