For some reason these crackpot theories appeal to people who feel for one reason or other that they are "missing something". Then charismatic personalities gravitate towards these communities and spin out yarn that feels right to the specific people listening to them creating a belief. Feels right and belief are the keywords here. There is no proof that would withstand rigorous criticism.
With science, you should love your pet theory, put also put the hard labour in to prove it. And if your testing creates evidence to the contrary, you should be cognitively able to abandon it.
These crackpot theorists start from their pet theory, don't actually study physics or what ever their theory is about, and spend all the effort in spinning yarn about how great their theory is, instead of actually proving it.
If you want to learn about actual physics, there is great introduction lecture series by Leaonard Susskind called "The theoretical minimum":
https://www.youtube.com/playlist?list=PL47F408D36D4CF129
Grab a pencil and paper and start watching :) !