I have a bit of a confusion in regards to the Mueller investigation.
While it was undergoing, we were repeatedly told that "proving collusion" is pretty much impossible since there's no such thing as "collusion", legally speaking. The best one could hope for from Mueller's investigation is that he would highlight enough ... wrongdoings by Trump and his team, that Congress would end up impeaching him.
Nobody ever actually expected Mueller to do his investigation and end up concluding it with holy moly, I actually just caught Trump in the act of admitting he is a Russian agent! I even have it on tape! Woho! Collusion proved! ... rather, the expectation was always (at least from a Democratic perspective) that the investigation could bring to light certain facts that would make impeachment a viable topic of discussion.
However, now that the investigation has concluded, why is there then any possible debate on whether the report should be released to all members of Congress, completely unredacted?
Isn't that what the investigation was for? Isn't that why it's called an investigation? If the goal was to simply deliver a yes/no answer to congress with respect to whether Trump can be criminally charged or not, well, we all already knew that was never going to happen. It was the contents of the report, and what consequences those contents may have, that was the primary goal with the investigation, was it not?