This may sound a bit consipiratory but I have wondered if the lack of support for effective long term male contraception is purposely because it's suspected tha

This may sound a bit consipiratory but I have wondered if the lack of support for effective long term male contraception is purposely because it's suspected that the birth rate would plummet and we would see huge population decline. As it is now there is still a high chance of unplanned pregnancies across the population and I wouldn't be surprised if they made up the bulk of children born. If men had an effective fire-and-forget long term contraceptive then unplanned pregnancies would be practically nonexistent.