The more interesting question is, why has the last decade seen the explosive rise of retarded conspiracy theories about how the Earth is flat, we never went to the Moon, etc.
My take is that it's fueled by distrust in authority. Corporations and governments have been wrapping their shit up in the flag of ¡SCIENCE! for so long now, and been caught with their pants down on so many occasions, that trust in science itself has been seriously eroded.
You can only tell people that, e.g., "our new synthetic opiods totally aren't addictive" so many times before people just stop believing. Corporations use science as a marketing tool, with the result that people start looking at it as propaganda by default.
Combine that mindset with a generation raised on seemless photorealistic CGI, and all of this emerges quite organically.
Another factor is the eternal boomer turning his back in space so he could focus on weed, cummies, and feeding the third world. Their lack of will is the direct reason we don't already have bases on Mars. If we did, no one would be wondering if Kubrick faked the Moon landings on a sound stage.