I daresay that it's a bit odd to call these "unforeseen" consequences.
They've been at the center of the minimum wage debate for the last 50 years and the exact same questions get brought up every time the issue is discussed. A higher minimum wave decreases the likelihood of business expansion or of hiring another worker, thereby preventing the unemployed from finding jobs. It's pretty much a given at this point.
They do know. They just don't care.