Are they religious? You can use that against them.

en.wikipedia.org/…/Parable_of_the_drowning_man

During the COVID-19 pandemic, modified versions, in which the religious man refuses several entreaties to wear a mask and later to get vaccinated, finding out after his death from the disease that God motivated those people as well, circulated among Christian communities to counter vaccine hesitancy.

Tell them Covid is Satan’s doing, and God sent the vaccines.