Okay, if other altruists aren't motivated by being angry about pain and suffering and wanting to end pain and suffering, how are they motivated?
Ask them, I'm not an altruist. But I heard it may have something to do with the concept of compassion.
I genuinely don't see how wanting to help people is correlated with ending up killing people.
Historically, it correlates quite well. You want to help the "good" people and in order to do this you need to kill the "bad" people. The issue, of course, is that definitions of "good" and "bad" in this context... can vary, and rather dramatically too.
I think setting up guillotines in the public square is much more likely if you go around saying "I'm the chosen one and I'm going to singlehandedly design a better world".
If we take the metaphor literally, setting up guillotines in the public square was something much favoured by the French Revolution, not by Napoleon Bonaparte.
If I noticed myself causing any death or suffering I would be very sad, and sit down and have a long think about a way to stop doing that.
Bollocks. You want to change the world and change is never painless. Tearing down chunks of the existing world, chunks you don't like, will necessarily cause suffering.
The French Revolution wanted to design a better world to the point of introducing the 10-day week. Napoleon just wanted to conquer.
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A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
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