It does when you know the donor is awful and you conceal the origin of the donation.
Bottom line, I think a donation, an idea, a contribution is useful even if it comes from an awful source, but the problem lies in whether you reward/enable the source's awfulness. I think that's the argument to make, as opposed to just focusing on whether the source of funds was a morally acceptable person.
As I said on another thread, if you really want to donate anonymously to a good cause, you just call a lawyer and pay a small fee to have them to submit it on your behalf.
If we said this must be prevented because the donor is not a truly ethical selfless person, there would be much less money going to good causes. And who would be the judge of which of us is good enough to be allowed to donate to charities?