I assume you are expert in some domain. How would you feel if someone who is not familiar with your domain comes in and start questioning your expert judgment? Even in your domain probably being an expert means having access and expertise of equipments. Without that I cannot imagine having expertise to judge what is correct and what is wrong for that domain.

I reject the scare quotes you're putting around the word vaccine.

The COVID vaccine is a triumph of human ingenuity and we should all feel incredibly proud it exists. It was the moon landing of our time.

More broadly, vaccines have probably saved more human lives than any other medical technology in history.