Getting vaccinated against Covid-19 produces the most overall happiness, which is morally right!

The argument that was approved is:
1. If getting vaccinated against Covid-19 produces the most overall happiness, then getting vaccinated against Covid-19 is morally right.
2. Getting vaccinated against Covid-19 produces the most overall happiness.
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3. Therefore, getting vaccinated against Covid-19 is morally right.
You are supposed to defend this argument with the Utilitarian theory.