I don't have a problem with the term enlightened self interest, but I also believe that it can be pushed way beyond reason. There are actions where the gain to others so far outweighs the gain to the actor that I think enlighted self interest becomes moot. I believe that is the case in the example I used, the soldier throwing himself on a grenade.
In that example, we can with a little effort come up with what might be a benefit to the actor, but those benefits certainly are small when viewed next to the cost to the actor of his actions. Let's face it, the posibility of some future life, of fame or glory after your dead may well be real, but when compared to getting your legs blown off in the here and now or of getting killed only to find out your belief system really is wrong are not what I'd consider really great incentives.
While I may well believe Heaven to be real, I'm in no hurry to put that belief to the test.
Aslan is not a Tame Lion