Our classical line of conspiracy thinking may be "If the CIA was involved it means they killed him"
But maybe we are growing in our understanding that the world is very complicated, and that any number of actors could have been indirectly involved, with any number of motives, and that the 'final straw' may have been something a bit more simple, but facilitate by the complex web of weirdness.
It's very easy to believe that the CIA etc. wanted Castro's head and an invasion, and that they were upset JFK wasn't supportive, and that they took a lot of clandestine steps towards 'something'. It's even easier to believe that there were even rogue actors within the agency that either went to for for ideological purposes or maybe even by accident.
... and then the dominoes fell in an ugly way.
It'd be nice if some day we got to the bottom of this.