You yourself said the problem is humans, and that reality is perfect. If reality is perfect, that assumes that humans are the problem. If humans are the problem, then fixing that problem would make it their responsibility.
He might be.
Usually, it's considered a good thing to alleviate suffering. I guess someone could choose to do nothing, and stay "happy", but I certainly couldn't. Then again, I am more of an existentialist (the Sartre sort).
Nature is unthinking. But I would say it is callous not to help your fellow man if you have the capacity to do so without putting an undue strain on yourself.
Actually an interesting question. Some could argue that they are merely helping in order to make themself feel better. But I don't think that sort of "selfishness" is a bad thing. If people are hardwired to get good feelings from helping others, that's a bonus. And again, you are assuming brainwashing. I can tell you that my parents certainly didn't raise me as an existentialist; that's something I read on my own, and it felt "right" to me. Now you could argue that it felt "right" due to brainwashing, but then you get to a state where every person's actions are out of their control and are merely in reaction to the original "first movement", which eliminates any sort of free will.
Just because things are a part of reality doesn't mean they aren't tragic. Should the mother who recognizes that death is a part of life not grieve her son?
The second is certainly more calloused. Humanity has emotions; if you don't have emotions you're not human. And it's obviously not irrelevant since how we react to situations determines multiple fates. Even your supposed mystic will have opinions. For instance, does your mystic like the taste of chicken more, or beef? Which is the "true" reality?

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"according to reality"
