Well, here we are once again; it’s the time of year when millions of pro-life Americans will implicitly consent to the slaughter of innocents by affixing their signatures to the 1040 and other tax forms.
Your signature is by definition an act of consent, a willing approval of the deed. If your taxes pay for abortion, stem-cell research, etc, they do so with your authorization.
Don’t approve of abortion? Then don’t consent.