Huh, I was going to complain about it being a direct cut and paste from the document, but it does look like I managed to stick an 's' in there after I copied the text. Sorry, didn't notice.
The actual quote is:
> While Google hasn’t harbored the violent leftist protests
Still doesn't change the meaning, my point being that the "violent leftist protests" he talks about don't happen in a vacuum. On the other side of the 'violence' there's always been lovely people like the alt-righter "hero" Based Stickman inciting violence.
To me, his choice of side to blame for the violence is pretty telling of what he thinks about "the Left". Whether correctly or incorrectly identifying them as the culprits of the violence, he's making a statement about the "movement" and not the particular instance of violence.
On a different note, Damore chose to include mention of "leftist protest" because Google's culture is left-leaning – he's explicitly saying that Google is very left, while not so left as these violent protests. Mentioning "violent rightist protests" wouldn't be germane to his statement about Google here.