Only the unrepentant ones would do this, despite calling themselves Christians.
A post goes viral online, especially on Facebook, about a "Christian" smiling at the moment of hanging. As if he welcomed death happily as a martyr.
It is obvious, any unsourced article such as this is usually fake. The real character was a murderer (Majid Kavousifar), not a Christian.
To publicize something like this, is not doing any favor. It is not supporting Christianity, regardless of any good intention. It is a lie and therefore one makes God a liar. It is a serious crime.
"Oh, but I didn't know. I am only sharing what I heard." If one cannot be responsible for a fact one is communicating, it is best not to do that. Otherwise, it' not only irresponsible, but also lazy (do your own homework first).
"Okay, I will post a real true article, but I will remove the source." This is just simply rebellious. It is still manipulating the truth by hiding the truth.