Pictures or it didn’t happen.
Not that I don't think Simon Parkes is a Looney Tune Supreme, but I absolutely think the first two words in your screen name are apropos with regard to your quote above.
No pics of O.J. killing his wife? Then it didn't happen! No pics of Yeager breaking the sound barrier? Then it didn't happen! No pics of Jesus Christ? He didn't Happen!
On the other hand, we do have pics of the moon landing and there's still a contingent of people who maintain it didn't happen.