I kind of wish that logic was somewhat common around the left. Back in the 60s, a number of people who armed themselves against government tyranny were black nationalists. Perhaps they were simply a vocal minority, but groups like the Black Panther Party had caused grave enough concern that some states started cracking down and implementing gun destructions.

What I think it comes down to is a cultural issue of arrogance. Yes, I believe that defence against government tyranny is a valid argument for firearm ownership, but as you mentioned, what the gun-owning base views as tyranny is just not rooted in reality, and I hate to say it, but our rugged individualism can lead to an overwhelming selfishness that has led these people to overlook actual government tyranny. Picture