It's common to see babies cry and throw tantrums if they don't get what they want. It could be the simplest object, a pacifier, a ball, etc. Their development doesn't allow them to reflect on the consequences that taking that object might have for others; perhaps that ball belongs to another baby.
The first phase of ethical education is when the family tries to make the baby understand that they can't do or have everything they like. Children who struggle to grasp the consequences of their actions tend to exhibit social problems of varying degrees; they may use force to take toys they like from their peers, and so on.
We tend to assume that values education is overcome during preschool or primary school, but remnants of this selfish perspective remain long afterward, as is evident in many adults when discussing topics like bullfighting: "I want it to continue because I like it" or "If you don't like it, don't go, but you must respect me because I like it." At no point do they analyze the consequences their preferences have on the animal; the only relevant criterion seems to be their own taste.
These attitudes are not limited to animal abuse; sexual aggressors attack their victims "because they like it." When a relatively large part of adult society continues to behave without considering the harm they cause, something has to improve in our education system.