JTK, I suggest you read the book on Dieppe that I've pointed to, "Tragedy at Dieppe", by Mark Zuehlke and "An Army at Dawn", by Rick Atkinson. These books go into great detail about everything that you are talking about and would make you wonder at the guy in the documentary that you've seen.
One issue facing the Allies at that point in the war was landing craft. They just simply did not have enough, for an invasion force that was required to land in France. Also, as stated, by pushing up the Italian boot, they tied up many German divisions, some elite ones, that could have been put to better use in Russia and sealing off France from the Allies. One has to think about the war chronologically when looking at it now, not just dissecting it and questioning why it went down the way it did. The materiel available to the Allies, like the Sherman tank, wasn't there at all early on, as they used their old tanks and therefore when it made its debut, it wasn't there in the numbers present come D-Day. Also, to have air superiority, the Allies didn't have the fighter capability needed to do so until the appearance of the P-51 Mustang. Up until that time the Eighth Airforce got the hell shot out of them before and after they flew through the flak fields on their way to the target.
So it's one thing to say that they should have done this or that sooner, but to look at what was available to them then and when the materiel that was valuable in winning the war was finally available. Coupled with the numbers of German troops that they would have been facing, during Torch the Germans had more divisions in France than the Allies could muster, and these were battle hardened troops, with far superior materiel than that of the Allies. I would also add that the American brass, their Generalship, was an issue, as there were a lot of Generals who were lacking in the field of military command, in how it pertains to tactics and fighting a war.
Pure folly had the American's gotten their way and France was invaded. No doubt a failed landing, thus prolonging the war in Europe. If memory serves me correct, the American's thought about going on their own and doing it anyways. Thankfully they listened to their English cousins.