Because they are hypocrites (it's a fact, not a judgement). And it's interesting because hypocrites is one of the things that Jesus specifically calls out in the Gospel and seem to have much disdain for them. As a Catholic, I practice my faith with as much common sense as I can, to not judge, and forgive, as Jesus wanted us to.
As such, I am against the death penalty, against "preemptive" wars (of course defending your territory being invaded is justified), against 2nd amendment, and support women's right for abortion. To me, this is common sense that aligns with Jesus' message.
I cannot picture the loving Christ looking at a 13 year old child pregnant because of rape/incest and go "this new life is a miracle and it was my will". I reject this notion of "every conception was God's will and is sacred".