Elizabeth, No matter who blames who or who feels bad or guilty, a person died and probably for the same reason many others have and will. People who refuse to be vaccinated.
I have a good friend that refuses and I hate to say it but I need him to help me move in a few months. I can't cut him out of my life. I'm sure I'm not alone. Many people like your friend's mother would have to sacrifice family and friends essential to their very happiness to avoid all anti-vax people. We are all kind of stuck between a rock and a hard place and there are no winners.