It is not an accident that Canada has a rate that is 16 times higher than the UK and only half of the US of lethal encounters.
I see good intentions to lower this with little result however there must be a good reason why we are at these levels  What is it that the UK police force does different than our force. There is one statement the UK force has adopted that is their main guidance. The PEELIAN PRINCIPLES" the intent to have as low as possible lethal violence as possible in any occasion.  No guns are carried only by special police forces.
Police forces are rarely killed on duty. There is something structurally wrong with our police force and until this is not worked out the lethal incidents will continue.