You do realise that police don't get training for situations like this either?
If the staff member made a complaint, it might be that the father was going to be arrested for it to safeguard the staff and that's why they wanted to talk to him away from his daughter. At that point, he was refusing to move. So how do you effect an arrest in those situations without force being used?
They'll certainly have more training than I have as an IT professional or he had as a respiratory expert.
Tact. That's the word which is lacking from the whole thing. If we are expecting a, basically, grieving parent to behave rationally then I think it's fair to expect the ones who are more trained to deal with confrontational people to behave better.
As I said in my OP. There are no winners in this but my sympathy is only with the one experiencing something traumatic. The father.