I would not dispute that the American military equipment in 1967 was probably superior to its Russian counterparts, however the Arab armies had far more of it and far more manpower than the Israelis. Israel destroyed the Egyptian Air Force before it ever got off the ground in preemptive strikes.
I actually knew someone who was a veteran of that conflict (on the Israel side). He is now deceased but he told me that the Arab leadership was ineffective and they were disorganized and scattered pretty quickly once things started going against them. He fought under Moshe Dayan and knew him. Dayan and others like him were effective and proven military leaders. In the Sinai portion of the conflict, the Egyptians were badly outmaneuvered and the evacuation is what specifically led to the request that the unfortunate General Amer kill himself. It was convenient that Nasser had a fall guy and he was the designated fall guy for the defeat, although certainly it was not all his fault. This enabled Nasser to remain in power and claim he was let down by incompetent generals, much like Hitler had claimed at the end of World War II when the Germans had much superior weaponry to the Russians as well.
I actually knew someone who was a veteran of that conflict (on the Israel side). He is now deceased but he told me that the Arab leadership was ineffective and they were disorganized and scattered pretty quickly once things started going against them. He fought under Moshe Dayan and knew him. Dayan and others like him were effective and proven military leaders. In the Sinai portion of the conflict, the Egyptians were badly outmaneuvered and the evacuation is what specifically led to the request that the unfortunate General Amer kill himself. It was convenient that Nasser had a fall guy and he was the designated fall guy for the defeat, although certainly it was not all his fault. This enabled Nasser to remain in power and claim he was let down by incompetent generals, much like Hitler had claimed at the end of World War II when the Germans had much superior weaponry to the Russians as well.