Yes. Both Alvino’s and Sybe’s comments are quite relevant.
In fact, Alvino’s comment is related to the role of the brain, and Sybe’s is related to the mental body or gandhabba.
If the brain is damaged, the gandhabba is not getting the correct information and that affects the decision making by the gandhabba.
– The following video is a really good example of how the gandhabba is affected by the brain, and in general, the physical body. The lady could not see only because there was something wrong with her PHYSICAL eyes, the optic nerve, or the visual cortex in the brain. Once the gandhabba came out, it was able to see for the first time in her life:
On the other hand, if one has wrong views, then that is an intrinsic problem (per Sybe’s comment.)
This is why those two cases (cases 2 and 3) are difficult to nail down.
In Case 2, person A needs to be careful in giving that information to person B, since he knows that particular aspect of person B. Unless person B is in danger of catching the virus, it is better not to convey that message to person B.
– This is comparable to what is discussed in the following post on right speech:
“Right Speech – How to Avoid Accumulating Kamma.”
Case 3 is definitely due to ignorance. The grandmother would be responsible for her actions done out of ignorance.