Not a conspiracy-lover, but this is what came to my mind instantly considering there is a still-ongoing investigation about another ESA project - the failure of ESA's Schiaparelli landing, which slammed into Mars back in October 2016.
https://en.wikipedia.org/wiki/List_of_missions_to_Mars
The idea that there's a conspiracy at work is ridiculous. We're not exactly at the "Star Trek" stage of humanity here. Landing on Mars is still risky.