While you could know about his complete idiocy in the face of the Communists and trying to handle military matters, you probably don't know that he was the poison pill that destroyed us with his immigration dream, his dream to replace the traditional Americans with foreigners that would depend on his socialism and vote for his party.
Protestants don't vote democrat and never have, except in 1932, 1936, and 1964, while the first immigration to America which started in the 1840s had diluted the Protestant vote, JFK's goal was to get away from all Europeans and go third world, and also to open up chain immigration to bring the new voters in faster.
That is where we are today.
True, and LBJ ‘Great Society’ was a final nail. The problem with leftists is that ‘Ends justifies mean’ for them. For honest politicians political control is a mean, for leftists their means are everything to gain and maintain control which is their ends.