How about the hate of Democrat/liberals, who label Tea Party members and other Republican leadership as "terrorists" (despite their not committing violence), while never labelling muslims who are actual terrorists as terrorists?
Liberals have also been quick to put "right wing hate" labels on multiple shooters over the last 5 years or so, despite that the shooters actually turned out after closer examination to, in fact, be liberals.
Gabrielle Giffords shooting.
Aurora Colorado shooting.
Sandy Hook shooting.
Trayvon Martin shooting.
Plus at least two other liberal college professors who shot up their campuses.
And the incredible media silence over Christopher Dorner's praise of MSNBC and other liberal-media pundits as the ideological source of the indoctrinated rage that fed his killing spree.