The Warren Commission and the JFK Assassination

We've been relying on evidence that was gathered by the Warren Commission. A lot of people are suspicious of the Warren Commission and its conclusions about the JFK assassination. I think it's quite plausible that the Warren Commission was determined to find that it was a lone gunman who killed Kennedy. Could someone else have faked all this evidence as part of an attempt to frame Oswald? Anything is hypothetically possible, so sure some intelligence agency could have faked the note, the pictures, and the ballistic evidence. We can't just assert those things; we need evidence to support them. So to my mind, the evidence still points to Oswald's involvement.