Spare the rod punish society. For when evil is allowed to go unchecked it slowly invades all our life’s even the criminal. Tough love works much better then weakness which only amps of the crimes to full volume. We see this occurring with our “peaceful riots” that have taken over many a city street over the last few months. G-D provides this wisdom in the holy book which balances mercy and punishment in such a way that no real crime goes unpunished.