They're called dangerous dog breeds because they are, some more so than others. Any dog can be dangerous in the right situation and under the right circumstances. Too often people down play the potential certain breeds have and the damage they can do when given the chance. They get complacent and in some cases delusional and think that because they raise them a certain way, then they can or will never do harm to anyone or anything when that's just not the case. Add to that the fact that people rarely research the breed they get, or just think that they can train out any negative traits. Those traits (genetic) can be managed but not trained out.
People are more than willing to accept responsibility and praise when the dog does what's expected. But if or when that changes they're quick to point the finger at the dog, or any and everyone but themselves. At the same time people on the outside looking in are quick to blame the owner, even though in most cases it is the owners fault,... but not always.
For me it's both how you raise them as well as their genetics, including mixed breeds.
But to add to this thread, here's 3 of my dangerous breeds.
Powder and Natsuki catching some rays on friday.
Powder later moving out of Natsukis way.
Cocoa razzing Natsuki
And Achilles nuzzling and dwarf bunny he watched me and a neighbor catch outside.
And 3 dangerous breeds with a fluffy