Because they are a joke, having recently dealt with the Austin Hospital during January and February as a carer for my Mum the treatment each time was different.
Emergency department a few times, allowed in with an surgical mask, other times swapped to an N95, Mum didn't always have to change when I did.
Emergency department waiting room, allowed to stay a few times, others kicked out by security as the nurse in charge said I had to leave "due to Covid and no visitors" yet people sitting maskless and old towels and rubbish all over the place.
I was let into the ED treatment area a few times, others nope, not happening, and kicked out by security after I refused to leave my elderly mother alone.
All up to the nurse in charge as to what they will allow/enforce as a carer, which reminds me I must chase up my complaint to the Austin Health board and AHPRA about one of the nurses in charge that caused my issues.