Have all human beings got the capacity for compassion? According to Buddhist doctrine and Buddhist scriptures, have all human beings got the capacity for compassion or are some humans born without the ability to feel compassion. I appreciate that this question may have a particular answer from a scientific point of view but I'm interested what the Buddha or Buddhist teachers have to say.
As i have understood it from a theravada buddhist perspective then all human beings consist of the five aggregates and in here is the 2th aggregate of sensations. As far as i know the feeling of compassion falls under either this aggregate or the 4th aggregate of mental formations since compassion is also one of the 25 beautiful cetasikas. Or maybe it falls under both aggregates. 

So in that sense all human beings have the capability to feel compassion.

When that is said i can imagine some occassions where the surroundings might not "allow" for circumstances to be created in where the feeling of compassion could arise. As all the aggregates are subject to the three signs of existence the feeling of compassion is dependent upon causes in order to arise. If these causes cannot arise due to the human being existing in such a poor, dangerous or violent environment e.g. a prison or extreme poverty then the feeling of compassion might not arise.

Also there is the factor of how much spiritual work the human being has done in this life and past lives which might affect in what degree there can be created causes that leads to the feeling of compassion.

This is my own view on it based on my understanding of the buddhist doctrine. I might not be right about this so feel free to correct me if im wrong so i can also learn from it.