There are some things that are false on their face; i.e. crying and/or bleeding statutes, crosses in toilet windows, images of Mary in scrambled eggs, UFO’s, Bigfoot, etc. There is no need to be there, one simply uses common sense.
Wait a moment. How exactly do these things prove or even relate to the claims of Fatima?
Why, one might adapt your reasoning to deny that Jesus did a single miracle or rose from the dead. After all, the only "proof" we have of these is the testimony of witnesses and the historical record of fulfilled prophecy -- exactly has Fatima has.
My cousin is a minister in Italy. There’s a lot of stuff going on there, i.e., crying/bleeding statues, etc. Demonic.