Things may be _generally_ considered good or bad because a large amount of people adhere to certain sentiments toward certain actions.
People, in general, do not like to see babies tortured. So the act is "evil" because society in general disapproves of it.
On the other hand, you have a group of sadists who think that torturing babies is grand.
But a "universal good" is not meant to be voted democratically. So just because many think that it is bad does not make it universally bad, it only makes it bad from the perspective of the majority of society. Society deems things bad, and attempts to remove them, because they have negative effects on its well being and cohesion.
Then again, you brought up a somewhat silly example, because most humans are against inflcting suffering on another for one's own amusement.
Then again, look at the romans, they fed live people to the lions for their amusement. So they thought it was good. I don't see a large distinction between adults and babies for the purpose of this argument.
I don't think the Romans thought feeding live people to the lions was good. People can chose to be bad and when they do it is not evidence that they thought it was good. If someone thinks torturing people to enjoy their screaming is good, they are simply mentally defective.
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