It's a fine line between stopping supposedly peaceful protests disrupting the lives of ordinary people going about their business, whether that be enjoying the ceremonies and traditions this country still does well, trying to get to hospitals to work or for treatment, just getting to anywhere on time, and shooting people with rubber bullets, using water cannon etc.
Looking at some protests recently which have become violent, putting police and public in danger, police chiefs have difficult judgements to make about the intentions of protestors and what action to take to prevent this.
No-one is suggesting they should be using firearms, rubber bullets, water cannon as is usual in other countries, including many of our neighbours.
They probably got it right on this occasion.