This is a cool video on rocketry, but you'll never convince these people. They've put years of their life into this stuff and they've been lost to sunk cost fallacy; the idea of that time being wasted is a threat to their sanity and so they don't even entertain it.

This also perfectly describes why people refuse to see all religions and supernatural beliefs are a lie. They can't admit they've been believing and living for a lie almost their whole life.