"Other people" knew the risks and could have stayed home locked themselves down if so they wished, so by going to that "crowded pub" they also made a choice. No one forced them to go to that "crowded pub", again the key world is 'voluntary'...so I see no civil liberties infringed.
1. As a Doctor I made that choice to care for the sick, again I am not forced to be a clinician -I can choose another career path/to resign from my post as a clinician -and go into a non-clinician role within the health care system or find a new career.Even the nurses and doctors who will look after you unconscious on your ventilator will be exposed to your infection simply to care for you - simply for you to exercise a flawed concept of choice. Sure they can choose not to care for you, but I'm uncertain whether you're advocating health care professionals simply go home every time a sick patient shows up at a clinic.
So yes any Doctor or Nurse that doesn't want to look after me while "I am on that ventilator..." is not forced to look after me, they can go find another career. Again You made the choice to be a Doctor or Nurse that is your choice, but no one is forcing you to stay in that career if you deem it too dangerous not safe for you.
2. Clinicians/Health staff use PPE (Personal Protective Equipment), I am not advocating we don't use PPE, but I should have the choice to go to that crowded pub at 90 years old with my Cancer and PPE. AND the other people in that pub have the choice NOT to go to that "crowded pub", to go there with their PPE, or to go there without PPE and take the risk. Again we are not driving a truck through civil liberties...