First of all, simulations do little or nothing to explain how the original civilization (that produced the simulation) came to be, how do they know that they are real and all the other fundamental questions about the whys and hows of existence seem to continue unanswered. Of course, we might imagine that our difficulties in getting to the answers to these questions are a consequence of our limited existence as beings living in a simulated reality. Perhaps beings living in a "real" reality would have cognitive powers and a way of relating to the real world quite different from ours. Perhaps the real world, in contrast with the simulated one in which we, according to our current speculation, are living is so different as to allow for answers to these questions to be obtained. Perhaps... perhaps not. Whatever the reality may be regarding these possibilities, we are speaking about things that seem to be completely outside of our ability to know the answer to them. For instance, if we speak about the analogue of a cube in four or five dimensions, we might not be able to visualize it, but we are able to say how many faces, vertices, angles and all the other properties that describe it. We may not be able to see it, but we know how to describe it. But here we have no idea about what these beings would have to be like, our their world would have to be like, in order for them to have the answers that we have not. How could they avoid infinite regression, circular causality, or simply a beginning with no explanation (as Stephen Hawking proposes). In all of those kinds of explanations, the question of "how did it all came to be" seems still unanswered.
Secondly, all the possible reasons for creating simulations clarify our ignorance. If we do hypothesize that we live in inside a simulation, we actually have no reason to believe in any specific reason for the creation of our simulation, since there are many possible reasons and we don't know how to calculate the probabilities for the main kinds of reasons. (Even if we did, we would only have a statistical answer, not the actual one).
On the other hand, what becomes clear is that, whatever the reason for the simulated world we may imagine to be, the world we live in seems always an opportunity for us to do as we will. Even if it is a trap or our will is just a fake will, whatever we may imagine regarding this, to us, it is still presented as an opportunity to do, to express ourselves, to choose or to just follow the strings of events.