The lede is buried here, the reason the US is not cohesive is entirely due to the former president who continues to this day to support and spur the anti-vax movement.
I've seen lots of "right wing" people saying that Trump is betraying them by recommending the vaccine constantly. I don't think he's anti-vax.
There are numerous [1] points [2] where he could have changed [3] things and saved many many lives but decided it would help him politically to do the opposite.
The anti-vax movement is a monster he created, fed and hoped would net him a re-election. That it's turning on him now (that he's no longer in office) is sad but predictable.
[1] https://abcnews.go.com/Politics/trump-downplaying-virus-mock...
[2] https://www.cnn.com/2020/07/02/politics/donald-trump-coronav...
[3] https://www.nbcnews.com/politics/donald-trump/calendar-confu...