That's not what I said. I'll try again. Maybe it'll get through this time.
Focussing only on what you don't like about the person, and ignoring his good traits, accomplishments, and characteristics is the anti-halo effect. Leads a body to a one-word summing up like "scumbag." Just like focussing only on those things you like, and ignoring the things you don't, and summing up the person as "hero" is the halo effect.
The Kennedys also took significant steps to clean up corrupt unions. JFK started the Peace Corps. RFK opened a conversation with Martin Luther King, and the Kennedys moved the Federal government significantly further along the road to support of civil rights. JFK massively accelerated the space program, which has produced orders of magnitude more value in technological advances than it cost, whether or not you value the basic research and advancement of knowledge it also produced. JFK also forced the Soviets to back down on nuclear missiles in Cuba. They were also inspirational to a lot of people, among other things.
On the other hand, as you say, JFK accelerated our involvement in Vietnam, didn't have a sexual morality many folks would admire, and engineered the Bay of Pigs disaster, and massively accelerated the nuclear arms race, among other things.
That's a balanced, rational, reasonably complex view of the Kennedys. It's the view I hold.
Make of it what you will.