From what i've seen both left and right leaning mainstream media is factual almost 95% of the time. That's the very definition of trustworthy.
Not if the 95% are mindless bullstuff news like "this 5 year old gave up this for his community" and "look at what this airline did to this man!!!" And the other 5% are purposeful mal-intent like we saw in the election.
I honestly don't know what news sites you read but, if all they say is "BOMBSHELL! hillary exposed!" and "hillary is in TROUBLE!" and "obama secrets REVEALED" they aren't at all factual, real news or anything of the sort. It's the equivalent to buzzfeed which is just "Annoying Orange might be IMPEACHED!" or "look what Annoying Orange IS DOING"
Funny, sounds like CNN.
"The Russian Connection!"
"Annoying Orange's first 100 days!"
"Sean spicer denies national socialist warcrimes"
Mainstream News reports exactly what happens, when it happens, the details of the scene, uses verifiable sources, etc.
Unless the details are shady, then they inject their beliefs as facts.
Opinion sites say their opinions on events, offer alternate or conspiracy theories on why it happened, and always go on a witch hunt for the same person or group.
It doesnt have to be the same person or group, it could be Blue Lives matter or the Annoying Orange supporters or it could be Annoying Orange himself.
In the end, you're led to believe that mainstream media is lying to you and that everything is false, but in reality you're just looking at a mirror
They aremt always lying, no one can lie all the time and not get caught, and most of the time the make mountains out of molehills. They just have their "safe news" thats neutral and always true, and then they blow anything out of preportion when views start getting low.
Sometimes they jump the gun and turn spectation into fact for the sake of getting views.
Unfortunately views are more important than fact because they are proditable organizations.
I believe News media should be Non-Profit.