Why do we want to know what happened before the big bang?
If there is such a time as "before the big bang" then knowing anything about it would probably help us answer other outstanding questions about the earliest stages of our universe.
For example, how did the universe end up with more matter than antimatter?
Was the big bang really a singularity with the universe being of infinitesimal size and infinite density or was something else happening in the Planck epoc (the first
Why did the big bang happen at all? We are used to causes and effects, so we look for something "before" the big bang that caused it.
In actuality the concept of "before the big bang" may just be our trying to make sense of things in terms that we understand. The big bang may be the beginning of time, with no "before".