You should look up the number of firearms incidents involving law enforcement in the US.Be careful looking up things on Wikipedia not every article on there is bias free.
And nine fatal incidents in 30 years that is very low a large city such as New York has that many in two or three years with about the same number of armed officers.They did seem to say that police had done nothing wrong in every case but that tends to be the case in the US as well.The English tally does not include incidents in Norther Ireland but that is an entire ball of yarn all together.
My understanding is that the men had both a firearm and a machete style weapon if someone had already used these weapons and still had them in their possession and did not comply with me I'd blow their head off too who they had killed would not be relevant either.Someone brandishing any edged weapon is a lethal threat if they are within 25 feet of you.A person brandishing an edged weapon and also not complying and also assaulted a person places them selves at the top of the use of force pyramid.