I hate to write out these words, but you're strawmanning.
The point is caffeine etc. corrupt the mind and cause a person's mental faculties to run in a way they were not initially designed to.
The point is not that these drugs are all extremely harmful, only that they are all harmful. Caffeine and other things get a pass because the "hard drugs" are so uniquely and visibly harmful that they overshadow all other forms of harm.
One could even say that this has tricked us into thinking that lesser drugs like caffeine or canabinoids are "effectively harmless" because they're not causing us to OD or steal things to get another hit or causing visibly psychotic states. But that is not true. We've simply accepted that the harm they due is not worth thinking about (this is subjective, not objective).
The use of the term "corrupt" rather than "alter" or "affect" is assuming the conclusion here. The human mind is not something that always works in the same Platonic perfection in a state of nature. Biological and cultural differences are major factors in what is considered normal at any given place and time.
Some people have conditions that make the way their brains work different than what is considered normal. Western technological culture imposes differences in social interaction and pressures on thinking and required performance that are far different than existed in societies even mere hundreds of years before.
Drugs can be a way to compensate for these pressures and find a way to exist in the world with as much equanimity as possible. And I say all this as a person who avoids all caffeine and illegal drugs, and uses alcohol very infrequently. I'm lucky I can do this and thrive in today's Western culture. Not everyone is as fortunate.
A small percentage of people, like myself, have clearly autosomal genetic conditions that means being 'normal' is just not on the cards. I have to take psychopharmacological drugs just to get close to normal.
Not everyone is the same, there is a lot of variety, what you say could indeed be true for most people but can also not be true for a small minority of people.
hEDS, there is a very long list of comorbidities and I tick off most of them. Not guessing, runs in the family, did a WGS and found the TNXB SNPs responsible.
I tried the no-drugs and being super healthy approach for the vast majority of my life, I look like a pro-athlete, the only reason I started the meds was due to figuring out the statistical possibility of having X things wrong with me was next to impossible without a common cause, and the ME/CFS with brain fog was destroying my life.
I also tried to quit caffeine but that only resulted in very negative effects that persisted for more than 4 months after going cold turkey, that's 4 months being largely housebound and not able to work for that one experiment. I've been at this so long that if you can think of something I've probably tried it - including the healthiest of healthy lifestyles.
Just comparing within my own family most are anti-drugs and anti-medications and their health is an absolute mess. I wish living a healthy lifestyle would be sufficient, I wouldn't have to walk a tightrope of balancing meds, but I don't get that option.
The point is caffeine etc. corrupt the mind and cause a person's mental faculties to run in a way they were not initially designed to.
The point is not that these drugs are all extremely harmful, only that they are all harmful. Caffeine and other things get a pass because the "hard drugs" are so uniquely and visibly harmful that they overshadow all other forms of harm.
One could even say that this has tricked us into thinking that lesser drugs like caffeine or canabinoids are "effectively harmless" because they're not causing us to OD or steal things to get another hit or causing visibly psychotic states. But that is not true. We've simply accepted that the harm they due is not worth thinking about (this is subjective, not objective).