Many people, and most leftists, won’t go near the idea that the guy they supported actually wants to destroy America.
Such an idea is so monstrous they can’t wrap their minds around it – add to it that those who support the man are accomplices in that destruction…
One way to at least get them to think about their support of the Destructor is to ask them to pose an alternative reasoning for his actions – they won’t be able to do this.
Thus they won’t admit to you that you’ve made them doubt their allegiance to his hopechangeness, you will have at least made them think on the subject.