Since money donated to PP is fungible, that means if the non-abortion branch is getting government funding, then more of the privately donated dollars can go to the abortion branch.
Hence, even if taxpayer funds get earmarked only for the non abortion branch, the result is more money for the abortion branch, and the only way to avoid that is to only fund entities that have no abortion branch to which they can shift more private donations to because their non-abortion branch got government dollars.
So bottom line, fungibility of private donations results in fungibility of taxpayer dollars, even if the regulation is that they are not fungible.
How far could we push this argument, however. I would assert that it’s up to EVERYBODY donating to something like PP to be sure that they support what their money might go to. Those who leave it up to chance will find the more nefarious thing prospering.
The guilt for the abortions isn’t on those paying the auditable funds. It’s on those who give the discretionary funds, because if you give “part-evil” discretion then you’re responsible if they choose evil.