By delaying the second dose, more of the most vulnerable cohorts can be vaccinated more quickly. By the time you get to vaccinating significantly less vulnerabl

By delaying the second dose, more of the most vulnerable cohorts can be vaccinated more quickly. By the time you get to vaccinating significantly less vulnerable cohorts with their first dose, you will also be second dosing the most vulnerable cohorts. So it's not really a case of denying the most vulnerable a second dose in order to give significantly less vulnerable people a first dose.