This was a good reminder to examine why we are criticizing someone. The criticism in question may not be helpful. Examining the "why" is, I believe, just as important to maintain social ties as it is to protect ourselves and our various communities (family, support network, social network, religious community, etc.).
For me, I have been quite frustrated with people I know being out and about without masks, and basically ignoring all of the hygiene and social distancing recommendations. It's as if it's too much of a damper on their social life, or too much of a hassle, so they are just ignoring everything. One person said it's not "real" to her because she doesn't know anyone who has died from COVID-19. I do not openly criticize them and I politely decline their social invitations. But believe me, I am critical of their actions.
If I review your post, I can agree that my criticism of these people probably falls into the category of fearing they might inflict damage to me, namely, infect me or someone else I know, with the virus. It would be extremely frustrating to learn it happened because of their irresponsibility.
That being said, in this example there is also a component of me thinking I am acting more morally, superior in character to them, that they are not doing "the right thing". This may be vanity.
I have a friend who thinks she knows best, who is a very black and white thinker, and she believes her way is the only right way to do things. She is constantly judging everyone against her own ideas, and you can feel it. She does not hide her opinion. I see her alienating people over and over again. Her social circle is constantly changing. As social beings, isn't this doing her more harm than good?
Her reasons may be one or many of the ones you've cited, but I feel there can simply be the attitude of superiority, and it does not need to go beyond that. A vanity, or close-mindedness.