I continue to endorse being selective in whom one spends time arguing with.
I didn't propose that you should engage in detailed arguments with anyone - not even me. I proposed that you should accompany some downvotes with an explanation akin to the three-sentence example I gave.
Another example of a sufficiently-elaborate downvote explanation: "I downvoted your reply because it mischaracterized my position more egregiously than any responsible person should." One sentence, long enough, no further argument required.
Glad to hear it. :)
I may have addressed the bulk of what you're getting at in another comment; the short form of my reply is, "In the cases which 'heroic responsibility' is supposed to address, inaction rarely comes because an individual does not feel responsible, but because they don't know when the system may fail and don't know what to do when it might."
I think I see what you're getting at. If I understand you rightly, what "heroic responsibility" is intended to affect is the behavior of people such as [trigger warning: child abuse, rape] Mike McQueary during the Penn State child sex abuse scandal, who stumbled upon Sandusky in the act, reported it to his superiors (and, possibly, the police), and failed to take further action when nothing significant came of it. [/trigger warning] McQueary followed the 'proper' procedure, but he should not have relied upon it being sufficient to do the job. He had sufficient firsthand evidence to justify much more dramatic action than what he did.
Given that, I can see why you object to my "useless". But when I consider the case above, I think what McQueary was lacking was the same thing that Hermione was lacking in HPMoR: a sense of when the system might fail.
Most of the time, it's better to trust the system than it is to trust your ability to outthink the system. The system usually has access to much, much more information than you do; the system usually has people with much, much better training than you have; the system usually has resources that are much, much more abundant than you can draw on. In the vast majority of situations I would expect McQueary or Hermione to encounter - defective equipment, scheduling conflicts, truancy, etc. - I think they would do far worse by taking matters into their own hands than by calling upon the system to handle it. In all likelihood, prior to the events in question, their experiences all supported the idea that the system is sound. So what they needed to know was not that they were somehow more responsible to those in the line of fire than they previously realized, but that in these particular cases they should not trust the system. Both of them had access to enough data to draw that conclusion*, but they did not.
If they had, you would not need to tell them that they had a responsibility. Any decent human being would feel that immediately. What they needed was the sense that the circumstances were extraordinary and awareness of the extraordinary actions that they could take. And if you want to do better than chance at sensing extraordinary circumstances when they really are extraordinary and better than chance at planning extraordinary action that is effective, determination is nice, but preparation and education are a whole lot better.
* The reasons differ: McQueary shouldn't have trusted it because:
...while Hermione shouldn't have trusted it because:
I confess, it would make sense to me if Harry was unfamiliar with metaethics and his speech about "heroic responsibility" was an example of him reinventing the idea. If that is the case, it would explain why his presentation is as sloppy as it is.
No, I haven't answered my own question. In what way was Harry's monologue about consequentialist ethics superior to telling Hermione why McGonagall couldn't be counted upon?
Belatedly: some more vivid examples of "hope":