Sick-Minded People Getting 30 Years in Jail

Recently, a lot of Taiwanese people have been angered by the decision of the judge on a case.  The case was about four sick-minded murderers who tortured a two-year-old boy to death.  They were sentenced to death in their first trial, however, the judges reverted the verdict later and sentenced them for 30 years in jail instead.  Many Taiwanese people joined a Facebook group expressing their anger toward the four merciless murderers and the judges.  I feel their anger and disappointment, and I am not able to understand why the four murderers were so heartless that they could not even be compared to animals.  We claim that we are the most intelligent species on the planet, but many things some human beings do are much less than intelligent than all other species on the planet.