To people, yes.
To dogs, jacks are a menace. If you are attacked by a pitt, the only thing better than another pitt for defense is probably a jack russel. He will lose, but he is fast enough to buy you enough time to get a weapon or get away. He is also just as ornery and bull headed in a fight as a pitt.
There’s a marked difference between a dog (JRT) that will stand and deliver to save its owner and a pit bull that kills, because it know how to.
Wouldn’t you agree?