Okay, my definition of sane is essentially: rational enough to take actions that generally work towards your goals and to create goals that are effective ways to satisfy your terminal values. It's a rather high bar. Suicide bombers do not achieve their goals, cultists have had their cognitive machinery hijacked to serve someone else's goals instead of their own. The reason I think this would be okay in aggregate is the psychological unity of mankind: we're mostly pretty similar and there are remarkably low numbers of evil mutants. Being pretty similar, most people's goals would be acceptable to me. I disagree with some things China does for example, but I find their overwhelming competence makes up for it in aggregate wellbeing of their populace.

gjm gives some good examples of heroic responsibility, but I understand the term slightly differently. Heroic responsibility is to have found a thing that you have decided is important, generally by reasoned cost/benefit and then take responsibility to get it done regardless of what life throws your way. It may be an easy task or a hard task, but it must be an important task. The basic idea is that you don't stop when you feel like you tried, if your first attempt doesn't work you do more research and come up with a new strategy. If your second plan doesn't work because of unfair forces you take those unfair forces into account and come up with another plan. If that still doesn't work you try harder again, then you keep going until you either achieve the goal, it becomes clear that you cannot achieve the goal or the amount of effort you would have to put into the problem becomes significantly greater than the size of the benefit you expect.

For example, the benefit for FAI is humanities continued existence, there is essentially no amount of effort one person could put in that could be too much. To use the example of Eliezer in this thread, the benefit of a person being happier and more effective for months each year is also large, much larger than the time it takes to research SAD and come up with some creative solutions.