>Chemical castration
>Doing anything that would solve the current issues
You'd turn the remaining men into sissies, mess with their hormone balance (and thus their physical health) and probably cause some bipolar disorders too as a result of said hormone imbalance.
>There's literally no downside.
You really didn't ask yourself that if chemical castration had no downside why we would have a cycling NoFap thread and nobody on this board is on it nor why chemical castration hasn't been used by a lot of countries on rapists or molesters because of ethical issues?
Next time before you ask a question, do some research yourself.
One search on Wikipedia and you got all your questions answered in <5 minutes of reading.