I know you're serious; but it's bullshit.
"All evidence is anecdotal" is a pointless defense against an indefensible argument. The truth is, we have far more evidence in favor of alternative theories, including theories that are far more likely and simple. Even if testimony is anecdotal, the amount of it trumps your baseless claims that have no means of verification (at this point). It's fun to question what we see on television; hell, it's fun to question everything. But it's another to put forth theories seriously when there's nothing to substantiate them.
Essentially, people know that conspiracy is a possibility; the mainstream media is even broadcasting that possibility. The possibility described in that picture you posted is an elaborate, unlikely theory that has no evidence to support it. Sure, evidence is anecdotal; but there's nothing "sensationalist" about believing a large number of eyewitness accounts, if they correspond and find relative common ground.