There's Many a Slip 'twixt Cup and Lip

Mises says, "Life itself is exposed to many risks. At any moment it is endangered by disastrous accidents which cannot be controlled, or at least not sufficiently. Every man banks on good luck. He counts upon not being struck by lightning and not being bitten by a viper." The social engineer attempts to bring about a desired outcome by forcing people to behave in a certain way. Mises sees the engineer and the social engineer as having parallel tasks: one manipulates lumber and iron, the other attempts to manipulate human beings.