You could post the victims' medical records and these conspiracy theorists would just call them faked. They made up their mind and started with the premise that this is a massive conspiracy and nothing will convince them otherwise. If you give them information that can be twisted to support their conspiracy narrative they will accept that as the word of God.
The debate never ends. Endless speculation about ridiculous conspiracy is their entertainment. SASQUATCH IS REAL PROVE ME WRONG SHEEPLE.