We keep hearing from cops how it's OK to kill someone who make a "firtive" movement. Do they even know what it means?

http://www.thefreedictionary.com/furtive

1. Characterized by stealth; surreptitious.
2. Expressive of hidden motives or purposes; shifty

1. characterized by stealth; sly and secretive

1. taken, done, used, etc., surreptitiously or by stealth; secret: a furtive glance.
2. sly; shifty: a furtive manner.

So, now it's ok for LE to shoot someone for just looking sly or shifty???

You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell