Should he be visiting his Mother?

Hi all, I need some advice on whether my anger is warranted.

My husbands mother is in hospital. She is 73. Has been in hospital for the past 7 months. She is due to have another major surgery (approx. 12hrs long) in the next month. This will hopefully mean she will be able to come home in the next 3 months. Her body is so fragile after her previous major surgery and she has lost so much weight. She keeps getting infections from all the tubes she has in her which keeps deferring her surgery.

My husband has made the decision to not visit her anymore due to our current self-isolation rules. We are to stay home unless we are essential workers. We both are. We have been video messaging her every day. She completely understands our decision. Here’s what angers me. My husbands brother is still going up to visit her once a week. We voiced our concern and told him it’s not a good idea. He is still working at a public service job and is still interacting with work colleagues. He said her Mental Health is very important too which is why he is still going up to visit her. He takes his children up also. They are all over 13 and wear PPE gear in her room, but we’ve also been told there is a shortage on PPE gear and all elective surgeries have been cancelled due to the shortage. So my question is - If you’ve been told by your government to hold off on visiting family members over 70, who are immunocompromised and to avoid visiting people in hospitals, would you consider it acceptable for his brother to continue to visit their mother?

My argument against this is, what good is her mental health if she isn’t able to survival be due to catching the virus or a bug?