system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect] How would the events of the rest of the trilogy been if Shepard had shown undeniable proof the the Reapers existence?

I made a post a few days ago about how much it bugged me that Shepard never recorded his missions, had a war reporter on hand or had backup properly examine and retrace his steps. I get why it was done story wise but it seemed very heal hearted realistically. In this case there's no denial that the reapers exist at the end of Mass Effect 1. Assuming Shepard is still killed by the collectors what or how does the rest of the trilogy continue from here?
gpt
The citadel council knew exactly what Reapers were. An ACTUAL REAPER tried to attack the seat of galactic government, which is the most proof anyone could have ever dumped onto the galactic doorstep. The Citadel Archives have a file that shows the council knew exactly what Reapers were, and had full knowledge of Sovereign's plans (most likely from Shepard's reports) all along. The fact that they "dismissed that claim" and edited the official story of Sovereign's attack was pure politics. They did not want to panic the galaxy by spreading stories of an unstoppable force intent on exterminating all civilized life. 

There was nothing Shepard could have done, considering a full fledged Reaper showed up at the Citadel. The sad facts of realpolitik and psychological manipulation would have caused ANY other proof (but what better proof is there than an actual Reaper?) Shepard presented to be ignored. 

Also, we know that not everyone was convinced by the Council's lame attempt to hide the truth. The entire Andromeda Initiative was conceived as a galactic evacuation. Maybe if Shepard provided more proof, they wouldn't have had to rely on such shady funding and gotten more volunteers from other people convinced of the horrible truth. But again, the Milky Way galactic stage as a whole would have remained unchanged. Shepard's story would have continued exactly as it did.