For my brother, I think it was a combination of her insistence (because, you know, NPR said it was “safe and effective”) and his company requiring it. (My company required it too, but I refused and got an exemption.)
As a result, he has been suffering nerve pain in his legs and back, is in constant pain and at times has had to use a walker, and according to my mother, has had some sort of personality change, which is possibly due to the unrelenting pain.
Oh, that is so awful. You can take it to the bank that he regrets his decision to get jabbed and is completely aware that his ongoing pain is a result of his decision. There’s a lot going on in his mind and body, but I’m willing to bet that the worst thing for him is his shame over his weakness in the face of your obvious strength. You are a constant reminder that you, a girl, his physically weaker sister, chose to fight for your beliefs while he, a physically strong man, just caved, probably because it was the easier path. Being forced to acknowledge your weakness in the face of another’s strength in the same situation can be very hard on a man. And I agree with you that the constant pain can change a personality. Just know that the bulk of his rage is directed at himself and he’s just displacing it. I suspect that deep inside, maybe waaay deep, he admires you tremendously and now wishes he had your courage and strength of conviction. It’s all very complicated.