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You need to differentiate between the public health and personal health issues here.
From a [i]personal[/i] health perspective, no vaccine and no treatment is 100% guaranteed to block a given disease in all recipients, and there is no guarantee against side effects. There is no 100% safe path.
From a [i]public[/i] health perspective, the Covid vaccines reduce the probability of infection, the severity of infection, and the odds of death. This has been true of every variant so far, and is doubtless true of omicron. The effectiveness of the vaccines against omicron may be lower, but it's nonzero.
From a [i]personal[/i] health perspective, no vaccine and no treatment is 100% guaranteed to block a given disease in all recipients, and there is no guarantee against side effects. There is no 100% safe path.
From a [i]public[/i] health perspective, the Covid vaccines reduce the probability of infection, the severity of infection, and the odds of death. This has been true of every variant so far, and is doubtless true of omicron. The effectiveness of the vaccines against omicron may be lower, but it's nonzero.