He may of had some problems, but all was completely overshadowed when he stood firm against the Soviets, that put this planet as close to total nuclear war, than many people probably realize.
During the missile crisis, off the coast of Cuba, Kennedy ordered one of our ships to depth charge a Soviet Sub....It was not known until much later, that submarine we were dropping depth charges on, was armed with nuclear missiles....It's reported a near brawl on board the Soviet sub broke out, over whether to launch or not. If they had, a total nuclear exchange would have taken place.
That close.
You fail to mention Kennedy's removal of Jupiter IRBMs from Turkey and Italy in exchange for the Soviets removing their missiles from Cuba. That's a quid pro quo not standing firm.