CIA’s detailed study of the Hitler Plot was to be used against Castro

[Phil Dagosto]

My latest research find about JFK and the Nazis is as follows:
Adding up all the above, it looks like Jackie was caught between her Nazi infested family and her interest in keeping her husband from being murdered. That's probably why Dallas was the only place she traveled to and appeared with her husband. She likely knew in advance of the murder plot by her family-connected Nazis and thought she might help foll the murder. And that's why she wore the blood-stained dress for days to show her hatred toward these animals.

Well if JBK "knew in advance" why wouldn't she just inform her husband, the SS and other authorities and insist that the trip be canceled?