There is no group with better humans. It's a failure of context, nuance and understanding if you think so.
Property is not lives, and your "but the middle!" is meaningless: the middle if it exists is a group of people going "well, someone's dead, but also what about that vacant Wendy's?"
Nobody really thinks that way. Better to discuss individual policies which will show that the vast majority of people comprise a complex mix of perspectives.
There were also assassination attempts from the other side:
https://en.wikipedia.org/wiki/2017_Congressional_baseball_sh...
https://en.wikipedia.org/wiki/2016_Donald_Trump_Las_Vegas_ra...
Should we count as political violence the plot to kill Barack Obama with a "death ray"? I think there's a distinction to be drawn between political violence and crazy people being crazy.
https://en.wikipedia.org/wiki/Security_incidents_involving_B...
Interestingly, reading the pages you linked and dredging up the Death Ray link induced me to notice that (1) the previous shooting of a Congressperson was by a right-wing terrorist, and (2) that page about Obama recounts something like 6 very real plots to kill him mixed in among a bunch of variously mentally ill people being delusional. I think it's pretty clear which way the wind blows here.
One side has leftists rioting in the streets and looting storefronts. The other side has conservatives plowing their cars through liberal protestors at full speed and murdering them.
One side has leftists setting police cars on fire. The other side has conservatives plotting to kidnap and/or murder mayors and governors.
One side has leftists throwing milkshakes at so-called "independent journalists". The other side has political candidates bodyslamming real journalists.