Because yes, even complete monsters usually care about someone, they can be personally affable or charismatic or nice to someone they personally like or even just as a matter of professional decorum, but the important thing is that this changes nothing.
Example: The BTK Killer was supposedly a great dad, very loving and supportive of his daughter. Outside the torturing people to death, solid guy by the sounds of it.
I believe this is the bigger factor in the effectiveness of capitalist propaganda. It’s so pervasive that is becomes the whole of reality, and you can comfortably take it for granted for your entire life if you don’t encounter the right people.