So why does MSNBC or CNN always call every attacker or shooter white? ?

Even media that is not running a bias narrative simply still has one primary function; to earn money. What will make money? A missing innocent young white girl conspiracy makes them more money than any other missing person. So if something even close to that or can be spun to be that exists they will all run it.  Mass murder, serial killer; cash cow. 

Hate whitey, you are a victim, you are entitled; definetly politically motivated. Financially motivated still though, the end goal is wealth like anything else. 

A couple of democrat congresswomen did too.  Why don’t Democrats have to be held accountable for their irresponsible actions and words?  Very communist like attitude.     They are INCITING hatred towards whites.  

for more views and thats it

Pushing a narrative that makes all whites look like homicidal hillbillies helps alienate potential nonwhite or suburban voters, and helps push for populous disarmament that the liberal media has a vested interest in.  Besides a few security guards, they're outmatched against an armed public.  The liberal media has openly said they support anti-white causes, so there's no reason to assume they wouldn't lie by structure and omission to push an anti-white agenda.

Example:

The ‘1619 Project’ Isn’t Anti-American — It’s Anti-White Identity Politics:

https://nymag.com/intelligencer/2019/08/the-1619-p...

Just calling it the way it is.  Sorry if that triggers you.

Because MSNBC and CNN support black racism.  

Blacks were happier as slaves.

Because they are left wing media outlets and the current DNC pushed anti white racism like critical race theory.