The one-child policy resulted in millions of “excess males,” which would be great for conducting a Taiwan invasion with very high casualties.
The more of these unmarried men who die on the beaches or at sea, the better, from the CCP’s POV.
OTOH, these single-child-family males were generally raised as “little emperors” with no male siblings, weak and timid fathers, etc, so they are not exactly Rambo material.