I wobbled my head and came to the conclusion that context is very important.

Dalian Atkinson was unarmed and had not been reported as attacking anyone when he was unlawfully killed (not murdered, the killer was found not guilty of murder in an earlier trial). He was also reported to be in mental distress in a situation that could have been de-escalated rather than using force.

That is very different to witnessing someone stab another person and then having to wrestle the knife from them to stop them killing someone.

Do you see the difference? because I do.