Earlier quoted context omitted.
This doesn't really makes sense. Two things that you mention, like determining what people need and role of random chance, don't have anything to do with justice. For me, justice is fulfilment of obligations between people, that we either take explicitly (as promises or contracts), or a very limited number that should be implicitly upheld by all — about aggression and property. But while helping others is a good deed…
I'm not the person you're talking to but I am autistic and I do experience a powerful obligation to help others in need. I feel it deeply in my very soul and I always have; I experience every choice not to act on it as a crushing moral and spiritual failure. I understand this isn't typical but surely you can see that it is a possible experience of the world for some people to have?
That does not contradict my point in any way. I do experience this "obligation" too, and help others, but I don't think this word fits here. But that's just an emotion — that's not a real obligation that I actually owe somebody except for myself.
Emotions are my own volition — I'm free to experience whatever I fee like. Real obligations are not; I have to respect them regardless of my internal emotional state.