Aw how sweet Jonna!
Arif, I know what you're saying and I do think its partly how they're raised, little human contact and demanded to be as aggressive as possible! Another dog you should add to your list are Bouviers and German shepherds - as long as people want to use these dogs for defensive/protective purposes they will remain hyper aggressive, but I think as soon as we begin to raise them as pets they'll mellow out - still innately protective, but not dangerously so - I don't blame you for being afraid of the dogs you're describing, they're intended to be that! (its just sad to me...again, in Detroit in the '70s it was a big thing for people to feed these breeds hot sauce to help make them mean...same thing is being done today with pit bulls - so yes, coming across a dog that's been treated like this, won't be a pretty or fun interaction!
