A form of appeal-to-emotion fallacy that treats any attempt to question of the official narrative about some tragic event as if it's somehow "disrespectful" to the alleged victims. Also known as the "You're disrespecting the dead!" trick.
A low-level rhetorical trick that lacks any semblance of logical basis and aims directly at the lowest parts of the human psyche, typically invoked as the last resort when any other argument failed.