This is not limited to the medical field, I was once downvoted on an HN comment until I edited it to state that I wasn't supporting Trump, because people were reading it that way.
It's funny you mentioned this because my original comment was something along the lines of:
"""
2016-2020: "I hate Trump, but..."
2021: "I got the vaccine, but..."
"""
But I erased that and wrote my comment above because I thought it had a lower chance of being downvoted.
I think his goal was to make it clear that he was not an anti-science or conspirationist himself.
