They're wrong because they have been deceived.
Christ also said the majority would be deceived. Looking at Obama's "fruits" (Abortion, separation of church and state, inability to find a church for his family to worship for 3 years) provides proof of Obama's heart for God and the deception of those who put their faith in him despite his Anti-Christian behavior.
Conservatives aren't smarter than lberals, our eyes have been open to the truth... sometimes after years of being deceived ourselves.
There are many ways to say "You're wrong" I've found that "you are deceived" says the same thing... without leaving a mark. Because I have to work with these people daily, I need to keep the lines of communication open for more discussion. As I said, the Obama photo shrines are disappearing, and I didn't rip all of them down myself (We have video security)
You're using deceit as a catch all when it was really the wrongful desires of their own hearts that earned them their rebuke.
And you're lying to yourself and others in the process. They had a choice not to do what they did and they did it anyway knowing that what they were doing was wrong.