You got back in before my edit. Ah well. I pointed out that if the nuclear attacks are carried to that point, questions of politics and obedience are irrelevant because everyone is dead. Short of annihilation, there isn't much that could be done to the Germans that wasn't being done by conventional means already.
And ultimately, well, yes, I DO think Hitler commanded that kind of loyalty. At least among his inner circle and what you might call his Praetorian Guard. No one else could reach him by the end. Supermen they most certainly were not, as you correctly note. They were something scarier - devoted fanatics.
Well, OK. But remember also that as the Western Front was engulfed and destroyed (Army Group B destroyed) and the armies on the Eastern Front north and south of Berlin became separated from Berlin,
Hitler for all practical purposes lost control of his armies outside of the immediate area of Berlin. He still issued his orders. Those orders simply weren't obeyed. And the SS were too busy turning their coats (into Heer) to bother anymore with enforcing Hitler's orders.
OTL, organized resistance in the West ceased at the end of February, 1945. After that, the Allies were just cutting up the carcass of a defeated Nazi Germany. By this time, Allied soldiers were fully aware of what the SS were, and were in no mood any more to take SS prisoners. The SS were well aware of this, and had been reduced to two classes: Those who wished to die with Fuehrer, and those who wished to live.
There simply wasn't enough of the former to hold on to power in Germany as things were collapsing around them.
I suppose what you might see is something that Eisenhower refused OTL but really couldn't ITTL: Local surrenders. As happened in Northern Italy, so could happen everywhere else. From local units to army groups, the German generals could simply ORDER their troops to immediately surrender to the nearest Allied troop formation, as well as open up the road and rail networks to allow the Allied armies to advance as fast as possible, to prevent Hitler from trying to countermand their actions.
As to Hitler's devoted bodyguard? When the people become more afraid of something (atomic weapons) than they (Gestapo/SS), it will be more a matter of the SS doing their damndest not to enforce Hitlerian rule, but rather just flat out making a run for their lives!
Having a fanatically devoted bodyguard (on a national scale!) didn't do Ceaucescu (spelled right?) any good in Romania...
In the so-called "Germany Campaign" of April-May 1945, the Allies basically took to the Autobahn and drove to the Red Army. When they encountered a German town that opened fire on their convoys, they stopped, deployed artillery, and opened fire. The poor artillery supply units had become overloaded with unused ordnance and were begging the frontline troops to employ The Big Guns. Goodbye town. The word got out about what happened to towns that resisted.

And what DIDN'T happen to towns that surrendered peacefully.
So you could easily see (again and again) what was attempted (and partially succeeded) in Munich: A company of infantry rose up and tried to convince the rest of the garrison to seize the city and surrender without a fight. Of course, the SS tried to put them down, and they were forced to flee. But not before causing the contagion of mutiny to spread to the rest of the Heer in Munich. Pathetically, while the US Army were welcomed into the city, the SS ignored them and went after the German Army mutineers! To the point where the American troops were attacking the SS from the rear while the SS were attacking their fellow Germans in the front! Not unlike what happened during the liberation of Dachau.
Add nukes to the formula, and you could see Anti-Nazi German civilian partisans (like the OTL '05 Movement) thrown into the mix.
