Germany was divided by soviet initiative. People were only barred in one way of the division, you should remember that. The US and Western Europe wanted nothing more than have a united democratic Germany, that would democratically chose to side itself with the West (the immigration flux in the two Germanies show very well which model was liked best). Germany had to be divided by force, by the Soviet Union and the Soviet Union alone.
Germany was divided because neither side on the Cold War would risk having a united Germany joining the other side. We will never know it the USSR would have followed up on its proposal for an united, neutral Germany. We
do know that such an agreement on Austria was successfully concluded.
We also know that the catalyst for the soviet actions in actually dividing Germany was the inclusion of the western part on a western military alliance.
Both sides took steps that sunk Europe into the Cold War, and things could have been different had either side made different decisions. For better of for worst, what would actually happen, I won't dare trying to guess. But there was the
possibility of avoiding the Cold War, and of that actually leading to the collapse of soviet rule over central europe decades before it did happen, that I do believe.
20 years ago most people would believe that the USSR would never allow its satellites to become free. The in a short while the whole empire came crashing down, almost without bloodshed (apart from local wars). Soviet rule, as all rule, required a semblance of legitimacy even on those places where it imposed puppet governments. And on the USSR itself. People had to be, at the very least, persuaded to consent to that form of government (thus the necessity of propaganda). How likely would it be that they would consent to dictatorship and soviet control over the central european states in the absence of an external enemy to justify it?
The hold the USSR had on its satellites, and its willingness to resort to war and violence to keep them, were vastly overestimated after the fall of Stalin and his clique. In fact even his willingness to go to war was overestimated. The West defeated the Soviet Union without actually having to fight it, when it became obvious that most of the people on those countries considered their governments illegitimate. If Europe had not been turned into an armed camp the political conditions leading to this loss of legitimacy might very well have come much sooner, and became so widespread that the government would not dare directly opposing chance.
In fact I don't think many political and military figures in the West, as well as the USSR,
wanted to end the Cold War...