Murder By Police — This Is All Too Common

SEE HERE  I am getting sick and tired of seeing these kind of stories where police on the flimsiest of excuses gun a citizen down.  This crowd (three cops against a 61 year old 5 foot 2 inch MS person standing in a drive way with a knife in her hands .... ooooo how scary.  She refuses to drop the knife so kill her?  We live in a society gone insane ... these cops should be behind bars.  If that's the protocol the people that approved it should be behind bars.  Give me a break ... wait her out or take the knife away from her.  How hard can that be?  Why shoot her at all?  Why a lethal shot?