So you would have no moral qualms with paying the painter who you know will paint your house but then also use your money to kill people?
The painter has a choice. I think when there is no free will, there can be no
moral blame. So, I would indeed have moral qualms with the painter scenario, but as I've pointed out, that analogy doesn't fit since tax payers don't have any choice.
I see your point, though, because I didn't make myself precisely clear in my last post. There can be a connection between this sort of responsibility and moral responsibility. That cannot apply to the execution scenario, though, because of the lack of free will. In addition, I would say that voting for anti-death penalty candidates would free people of any moral responsibility. What I'm getting at is that if there is some way for you to stop it or to try to stop it, not doing so would leave you morally responsible. However, if there is nothing one can do, he cannot be morally responsible.