What blows my mind, and it seems to be going way over the people that thinks this is a solid line of thinking is this:

You say, that if I support the death penalty, I should support abortion. So therefore you support the death penalty? If the answer is yes, you admit that you are killing a life in the process of abortion. If your answer is no, then that means you differentiate the death penalty from abortion and your argument is mute. There is no logical thinking and is all made to create an emotional response.