This article by the Dailykos has over 44k shares on FB.
‘Yes, Trump’s Aide Really Did Throw “White Power” Sign’
Where the picture shows Stephen Miller straightening his suite. Even Snopes claims it is false with a good explanation. http://www.snopes.com/stephen-miller-white-power-hand-sign/
I see the 2 effects of this type of hysteria as:
1. Negates any valid points or concerns the left may legitimately have as more moderate people will tune everything they say out.
2. Lead to more civil unrest and violence.