First off, it seem you have your own definition of "bilk." Yes, one might say Trump took advantage of the situation. Remember, it is the duty of the SS to protect the president no matter where he is or what he is doing. It was Trump's prerogative to play gold where he chose. About where the SS bunks, I have no idea who makes the rules.
As far as Kennedy's anti-vaccine and anti-fluoride stance goes, I agree with you. I believe that both vaccines and fluoride work. There is overwhelming evidence that they do.
I recall my mother having our dentist apply an awful tasting fluoride coating on our teeth. That was around 1956 or so.
It is interesting to note that it is Tulsi Gabbard's father, Mike, who is co-sponsoring an anti-fluoride bill in the Hawaii legislature. He claims that is what his constituent favor. I think it has more to do with his beliefs in Guru Chris Butler's Church of Scientology. Right now only military facilities on Oahu have fluoride added to their drinking water.