The immediate explanation for this is they read the same publications, talk among themselves, and form a community of opinion. A metaphor is a way of saying that one thing has the essential characteristics of another thing. . . The choice of a metaphor makes a big difference in how we respond. Niceties like civil liberties and protection of the innocent are not observed in a war. Drugs make people victims, not the enemy.
Machines perform repetitive tasks and have no use beyond that.
All wolf machines do is kill things, and not to just eat their prey. Wolves repetitively kill until there is nothing left alive for them to kill. Machines are designed to be efficient, so the metaphor also implies the wolves not only kill and kill, but do so efficiently. Machines have no wills of their own, no feelings, and have no moral status. We dispose of machines when they have no further use to us.