The latest "Friday Fax" from C-Fam details how most of the funding for UNFPA is coming, interestingly, from rich nations whose own population decline is an obvious problem for their future prosperity. The current manifestation of Thanatos, then, is apparently quite evangelical. The same folks who are bent upon their own extinction want to proactively spread their neurosis.
It would appear from this same C-Fam report that the United States is a sort of battleground nation in all this. Under The Bush Administration and the Kemp-Kasten amendment, the United States is currently witholding funds for UNFPA, while Democrats want to reinstate funding.