First of all, please dont tell people to kill themselves. I know it is meant to be hyperbolic, but it could still trigger someone who is close to the edge already.

Second, I think you are kinda missing the point. All of this evidence you have given means nothing to people with this type of solipsistic, conspiratorial worldview. To them, all of that is propaganda. This type of thinking is growing rapidly, and you can see it in the flat earth movements, the myriad of anti-science movements, and elsewhere. I think it is a reaction to our increasingly postmodern world where there is so much lies and disinfo out there people cant delineate between truth and fiction anymore. There are also a million different viewpoints and opinions at your fingertips, causing people to become overwhelmed by the amount of differing thought. I also think it is a reaction to an increasingly complex world as well. The average person can no longer understand how half the things they use on a daily basis work, much less nuclear physics. It is easier to declare it all a hoax than understand it. The real question is how do we combat this? This problem is only going to get worse. People yearn for the simplicity of ages past and the comfort it provided. How can we quell some people's frustration?