Overpopulation is a larger problem than most people seem to realize because they aren't usually thinking about anything more than how many bodies can be crammed into a given area. Once you start thinking about how many people a given area can sustainably support all the space we seem to have matters a lot less. I'm all for working to address overpopulation, but clearly there's a huge problem with choosing to murder or poison massive numbers of other people to "help".
When populations reach the point where they start genuinely thinking being dead or never being born is better than contributing to the problem they stop having kids, and start looking at suicide. Maybe you're at that point already, and if you made the choice to die in order to help, or by way of example, I wouldn't fault you for it, but your feelings on the matter should never become someone else's problem and it should never justify the actions of someone causing, or allowing someone to cause, large numbers of people to suffer.
Not sure how you got any of that from my message.
I'm not even suggesting we should keep using particular chemicals even if they're known to be linked to infertility, only that if said chemicals have a particular benefit, maybe the disadvantage of slightly decreased fertility is worthwhile (as it is that link hasn't been firmly established even after decades of research).
People don't need to decide if the "disadvantage" of being unknowingly poisoned until fertility is impaired is "worth it". Anyone who feels that they are too fertile can have themselves sterilized without the harm to the environment caused by these chemicals and anybody who hasn't made that choice for themselves should never have to worry about being poisoned either. That means nobody should get to decide it's worth it for them to keep using the chemicals if that means everyone else gets poisoned against their will. There's really no big moral dilemma here.
When populations reach the point where they start genuinely thinking being dead or never being born is better than contributing to the problem they stop having kids, and start looking at suicide. Maybe you're at that point already, and if you made the choice to die in order to help, or by way of example, I wouldn't fault you for it, but your feelings on the matter should never become someone else's problem and it should never justify the actions of someone causing, or allowing someone to cause, large numbers of people to suffer.