While I'm sorry you ended up with dead and sick snakes, it has nothing at all to do with whether or not newspaper is a sanitary product.
Your shavings could be handled by someone with the flu too. So could your rodents that you feed to your snakes. You know what? It doesn't matter because human flu virus doesn't make snakes sick, so that remark is as pointless as you pointing out that you had your snakes get sick and die after ranting that people use "dirty old newspaper".
The newspaper is not "dirty" any more than shavings is dirty, or the room is dirty, or the frozen rodents are dirty or the air that comes in from outside is dirty. No one keeps their snakes in a completely sterile Clean Room environment. No one is housing their snakes and tending to them in a hazmat suit with biohazard preventative measures in place.
You keep ranting about "dirty" newspaper covered in germs. You also keep mentioning "used" newspapers as if someone is wiping their bum with it before sticking it in the snake pen.
And as far as "You can't prove that newspaper never made a snake sick", of COURSE you can't prove that because you cannot prove a negative, and that makes that comment a non-logical statement. I could say that all of your snakes died from the lipstick that the rodent supplier's wife used... and then challenge you to "prove it never could happen", and you can't. What you CAN do is point out that no one has ever shown that a snake was made ill from using newspaper for a substrate.
You can continue to post about your snakes dying and being sick and not eating, but unless you want to show how you used newspaper and that made your snakes die, I don't see that it's relevant at all.