While you allude to it in #1, this can be attributed solely to: Taxes, taxes, taxes.
Rational people make rational decisions - taxes limit the number of mouths one can feed, even (and especially) if you are willing to work harder to do so in socialist countries. Taxes on income, sales taxes, taxes on transportation, gas...and on everything else that moves, and does not move.
It's taxes that lower sperm count, not chemicals!