Prove to me that rockets go into space and do the things we're coaxed into believing.
Physically prove it or forever hold your typing tongue/finger.
Aside from the thousands of obvious reasons:
You can do it yourself. Yes you can literally launch a rocket to space, and amateur groups have done it.
It doesn't matter how mystical/fake rockets seem to you, because they work. The math and physics all works out. This is
not disputable because every 12 year old kid has seen it in action when they build a scale rocket and launch it in a field. Usually people move on after that but there is nothing stopping you from continuing. Build a bigger rocket, watch it go higher. Build it lighter, watch it go faster. Build it better, rinse and repeat. There is literally nothing stopping you from doing this yourself other than money (which I'm sure the FE community can come up with given how important this subject is to them). Of course orbit is another story, but a ragtag group of FErs could definitely pool some money together and put this question to rest.