Other breeds are different. And some dogs are bred for their strength and power... and ultimately, their ability to incapacitate or even kill someone.
Oh ya, and last but not least, the idiot owner that does all of the wrong things that you list below. Dogs are domesticated but they are still animals with instincts and pack type behaviors.
I’m waiting for a story to appear in the headlines about a pack of feral and rabid chihuahuas mauling someone to death. Still waiting!