Shill - a person who poses as a customer in order to decoy others into participating, as at a gambling house.
Shill: "Oh, why don't you all get the covid-vaccine! I did, and I liked it so much, I went back a second time. It's the closest thing we'll get to Heaven on this Earth."
Suspicious poster: "If the covid shot really is so safe, why are so many people dropping dead after having the shot?
Shill: "Oh, conspiracy theorists say the darnedest things about our wonderful covid-shots. All coincidences, nothing to do with the vaccine."
Suspicious poster: "Well, what about that nurse that dropped down dead on live TV after taking the Covid-shot?"
Shill: "Oh, Tiffany Dover, she always faints when she has a needle, because she loves it so much. She was overcome with ecstasy. But she isn't dead, she's really alive. She just didn't like all the publicity so deleted all her social media profiles afterward, that's all. And her family are very shy."
Suspicious poster (one month later): "Hey, I just checked out the death records, and Tiffany Dover is dead!"
Shill: "Well, yes, she's dead now, but she was going to die anyway. I mean, 30 years old, she was practically a grandma. And nursing is a dangerous job anyway. Good thing she had the covid-shot, or she might have died even sooner. And even if the covid-shot did cause her death, it's like 1 in a million chance. Practically safe as eating a biscuit. "