Firstly, you have no statistics to prove your claim. Secondly, considering the number of people who self-report on the net, the percentage who suffer "irreversible sides" is very, very small when taking into account all the people who take finasteride. Don't forget that finasteride isn't just used by Androgenetic Alopecia suffers - it's been prescribed for 25 years for people with BPH, and at 5x the dose as used to treat Androgenetic Alopecia. That's millions and millions and millions and millions of people around the world who are taking or have taken a much higher dose, and have been doing so longer than Androgenetic Alopecia patients. Since that's the case, why didn't this "syndrome" show itself earlier? And how many people belong to sites dedicated to "irreversible" sides from finasteride? 10k? Less? There are only 3800 members on Propeciabelp's forums. Even if there are 10x that many people who get irreversible sides, that's an infinitesimal number when you consider how many people take finasteride (.008% if 5m take it world-wide, and that's a low estimate of finasteride users given that 40% of all men suffer BPH by age 50). Does it cause some sort of syndrome? Maybe? But it's clear that very, very few people suffer that, and that's a fact. So there are my statistics - where are yours? I mean, "shame on" me? Shame on you for peddling your fear mongering and turning so many off a safe, effective treatment.
To those rational readers out there, the odds are overwhelmingly in your favor that you won't experience any sides, much less "irreversible" ones. And given the alternative - going bald - it's a no-brainer. It's a real shame that so many have been scared off due to the fear mongering on these sites - so many more could have kept so much more hair if they just considered the real data.