There's a very undeniable history of eugenics in the US
since Buck v. Bell, 274 U.S. 200 (1927) is still standing case law. Those of us that were aware of this history didn't think it was prudent to go out and get a "free" injection from the government.
https://disabilityjustice.org/right-to-self-determination-freedom-from-involuntary-sterilization/