I tend to agree with you in general about drugs and big pharma. Even things like clinical trials have major concerns with generalizability and you NEVER know what other, less intended effects a drug may be having.
However, it often seems like you scorn all of science in general. This is odd because (not talking drugs/clinical trials) experiments are done by rigor and must be reproducible by others for verification and publication. If scientist A publishes that knocking out gene A causes effect A, scientist B has to be able to do what scientist A did and get the same result. If not the data doesn't make it to publication...or gets thrown out if problems are discovered later.
That's the thing that's good about science, if you think the results are nonsense one can do the experiment themselves.
Ignoring the absurdity of concept that drugs don't do anything to people yet big pharma can somehow make bad "drugs" that kill people...you must believe there are a TON of really, really fvcking evil people in the world if they are making these diseases and unleashing them on the world.
You'd be talking thousands of people all in on slaughtering other humans with diseases. If you believe that's really how people are, then so it is, but all my experiences have certainly not led me anywhere near that conclusion.