If we can’t assume then we need to agree on whether it was compelled or not. If it was then it had no more choice in the matter than do two hydrogen atoms combining with one oxygen. Else it chose to create a specific universe.
This is strictly an either/or question. There aren’t any other options. Which do you do with?
The First Cause was not compelled to create this world or any other world. This is evident by demonstration. There are two ways the First Cause may have been compelled: (1) It was compelled by something external to itself, or (2) it was compelled by its own nature to create this exact world and no other, lacking intelligence in itself.
(1) It should be fairly straight forward to see why (1) cannot be true. The First Cause is that which has no other cause. If the First Cause is caused in any way by another, it is both uncaused and caused. That is absurd, therefore the First Cause cannot have been caused to create by another.
(2) This is a bit more abstract, and I would borrow from Aquinas’ Fifth Way here, and perhaps the Principle of Sufficient Reason, but in my own words and only briefly. (2) supposes that the First Cause has always been directed towards this exact, one-and-only end, but it also supposes that the First Cause did not direct itself towards this end. There is insufficient explanation, no reason available, about why the First Cause is directed to this end and not any other end or any other world given that this world is not otherwise logically or metaphysically necessary (even if only differing by one sub-atomic particle and nothing more). The First Cause could not have inanimately determined its own nature, for that would require pre-existing itself to do so. The only other explanation is that it was caused to do so by another, which was shown as absurd in our reply to (1).
I hope that works, at least temporarily, but if that doesn’t satisfy, I am going to request we defer the question of whether the First Cause was “compelled,” as you put it. There is more to discuss on whether the First Cause has a will, but it’s more easily demonstrable after establishing the other attributes, like Intellect/Omniscience. Off the top of my head, the following order to take the attributes of the First Cause would be simpler.
(1) Immutability
(2) Eternal
(3) Simplicity
(3) Oneness (i.e. There can only be one)
(4) Omnipotent
(5) Omnipresence
(6) Omniscient/Intellect
(7) Perfect Goodness
(8) Will
There may be others, and I may realize it’d be better to swap somewhere or another, but in general some things more easily follow from others, and trying to do the Will first may be like trying to take a shortcut through a dense woods.
P.S. I intended to write this without the word God substituted for First Cause, and I believe I accomplished that. I have already read the demonstrations, been convinced of the arguments, and so the interchangeability is natural to me, but I do understand where you’re coming from here.