The difference is that Lefr Wingers jump to conclusions which are a) totally divorced from the reality of what demographics are violent and b) based on worse evidence.
 
Right wingers wait for video and/or a name
 
Left wingers take any witness account (unreliable) which suggests a white guy. Did it for Orlando and San Bernardino.
 
Centrists are rather good at critiquing the obvious misteps of the two sides. But they forget that's easy when you arent suffering from group conformity/polarization and also not actually doing anything you can possibly mess up on