You should include a link to it here.
I didn't read all the threads but maybe some don't like that you are implying that the shooter was politically motivated because they don't want it to seem like we're jumping to conclusions without all the facts.
On your central theme, I agree with you. When right-wingers act like wingnuts with no regard for facts or being reasonable and show nothing but irrational hatred for Dems, I too think some could be capable of violence. They have completely bought into the "us vs. them" mentality. Their thinking process comes across as delusional to me. They certainly do act like fascists sometimes and history tells us where that leads.
Perhaps liberals think most people (even conservative) are basically good so they don't want to believe that some would resort to violence due to politics. Maybe they think the wingnuts are all talk and no action. Maybe it's denial.
I've never personally experience physical violence from a wingnut, but have been threatened.
Before the '08 election I had a large homemade plywood Obama/Biden sign taken from my property and slung into the middle of the busy 55mph 2-lane highway in front of my house. Luckily I heard the commotion and got there before a car could hit it. No respect for public safety from whoever did that. Just a reaction and a response. That's what I'm afraid of. I had a local sheriff tell me to be careful on election day if Obama gets elected. Nothing happened, but I was, and will be vigilant.
I live in a very rural area in Alabama. I know for a fact there are militia groups nearby. I can easily imagine wingnuts and racists freaking out if the black guy gets re-elected. If the campaign rhetoric keeps heating up, I think that will exacerbate the issue. Hell, I've even had my own cousin call me a "baby killer" and claim Obama is "evil." I have also had death threats online due to expressing my political beliefs.
I am not really paranoid about it but I am definitely prepared. Some wingnuts really believe they will fight a new revolution in this country and want liberals dead. If they want a fight I will defend myself.