Also the chyron wasn't truly wrong, it was summarizing a report about what transpired over 24 hours. The protests were "mostly peaceful" until they weren't. That was all discussed on screen while the chyron was displayed. The only way to be misled by the chyron was if you were watching the channel on mute or you just saw the screenshot flying around the internet being pushed by people who wanted you to think the media is lying.
The chyron said "Fiery but mostly peaceful protests after police shooting" and it probably should have said "Mostly peaceful protests after police shooting turn fiery after nightfall" but that is both longer and clunkier. So they went with a more condensed version without thinking of the awful visual it would create when screenshotted. If this is journalism's worst crime, then we are in fantastic shape.