Mutant Wuhan Omicron Variant Low Lethality as Predicted so Aren’t the mRNA Injected Filling the Hospitals?

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If it’s true that currently about 8o% of the hospitalized wuhan patients in the U. S. are people who had been “vaccinated,” considering the Omicron variant is about 1/10th as lethal as the Delta variant, isn’t it logical to say that the immune systems of the “vaccinated” have been harmed? The Omicron variant is what the pandemic experts had been predicting, the more mutated variants less lethal though quite contagious, the “vaccinated” more vulnerable to infection resulting in hospitalization.