All of the mutations MU,Delta ect. "began
before the vaccines" were beginning to be given(viruses just mutate anyway) so it wouldn't make any sense for anyone to blame the un-vaccinated (everyone on the planet was un-vaccinated when they mutated) the problem with MU is that it evades the vaccine,prior infections,antibody cocktail ect. so
if Mu begins to be the dominate strain we will all be wearing tyvek suits to keep from catching it and arguing over people not having the sleeves taped up
https://www.junglescout.com/blog/coronavirus/