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in the indic religions, from which the concept of reincarnation generally comes to us, reincarnation is seen as a problem to be overcome, not a reason for hope.
Does it not also incentivize that person to do good in this life, so the next is a better life?
Fooling people to make a better society. It's very weird but, maybe, you're right. It's beyond good and evil.
The effects of any theory do not affect its validity.
He is not saying it's right and true because it "helps". Just that it does "help".
Note: I had to put those quotes, since there's no proof of its efficacy.
Why is it selfish?
Selfish in the matter of: "I shall live forever, because I'm important".