I actually agree with you on all this. My point once again was that the expectation from decades if not centuries of war leading up to this was that surrenders were conditional.
Not always. And do you think the Japanese entertained a lot of conditions of surrender when they were pillaging throuh Korea, Manchuria, and French Indo-China? I doubt it. The point is that they likely weren't relying on us capitulating on that point, and if they were, that's their own fault. We had greater resolve than they assumed.
I agree in part. I would say that the Allies wouldn't have been able to get Germany to unconditionally surrender at the end of WW1. The war was actually at a stalemate. Germany expected a pretty equal peace, but the English continued a blockade killing thousands if not millions of Germans while the negotiation was going on. Due to the extremely harsh conditions, the German people felt betrayed by their leaders paving the way for revolution. It came and we all know who and what happened.
I would also say that even with the conditional surrender if the terms were less harsh, there would have been a better chance for enduring peace. I say that because that is what had happened in the recent future and it removed the hardships that the Nazis used as justification for coming into power and doing the horrendous things they did.
You're right. To get an unconditional surrender in WWI, the Allies would have had to go all the way to Berlin like they did in WWII. Instead, a stalemate was reached, and both sides agreed to an armistice. Wilson and other progressive foreign policy advocates pushed for and got some pretty harsh points into the various agreements. But like most modern Democrats, Wilson and his allies spewed much harsher rhetoric than their resolve was willing to back up. I don't think they should have insisted on terms that harsh, but if they were going to, they needed a hell of a lot of resolve to back it up.
Do I think there would have been a lasting peace had the terms been less harsh? Maybe, but I don't think we can assume that. Why? Because Germany thought it got screwed - not just by the Allies but even more so by its own leadership, which was politically weak. Remember, the Kaiser didn't sign the armistice (and sure as hell didn't sign off on Versailles) and soon went into exile. The new government was somewhat corrupt and fighting off revolutionary movements by the far left (the Communists and their mob of Red Front Fighters) and far right (the predecessors to the Nazis and the SA such as the Steel Helmets and other groups).
The Imperial Army wasn't moving forward anymore at the time of the armistice, but it wasn't retreating and hadn't been defeated on the battlefield. Military leaders like Hindenburg and Erich Ludendorf frequently and publicly highlighted that fact and gave the public the impression that the Army had been stabbed in the back by corrupt politicians. Of course, the Nazis massively exploited that sentiment, and the bottom line is that a hell of a lot of Germans wanted to keep fighting and finish off the Allies. So even if Versailles hadn't been so harsh, there's at least a decent chance hostilities would have resumed anyway.
WWII was different. No sane person in Germany questioned their defeat. Their cities were in ruins. Their fuhrer was dead. There were millions of American, Soviet, British, and Canadian troops all over their country literally with guns at their heads. They were a defeated people. But I also think at least the Western Allies learned from the mistake of WWI and didn't clobber them with the harshest possible terms (despite there being an unconditional surrender), and of course, before too long, we did the Marshall Plan - basically the opposite of reparations. That was the right way to go - total defeat but the extension of an olive branch.