Your mention of anxiety (disorders) reminds me of Yvain's general point that lots of advice is really terrible for at least some people.
As I read HPMoR (and I've read all of it), a lot of the reason why Harry specifically distrusts the relevant authority figures is that they are routinely surprised by the various horrible events that happen and seem unwilling to accept responsibility for anything they don't already expect. McGonagall definitely improves on this point in the story tho.
In the story, the advice Harry gives Hermione seems appropriate. Your example would be much better for anyone inclined to anxiety about satisfying arbitrary constraints (i.e. being responsible for arbitrary outcomes) – and probably for anyone, period, if for no other reason than it's easier to edit an existing idea than generate an entirely new one.
@wedrifid's correct your plan is better than Harry's in the story, but I think Harry's point – and it's one I agree with – is that even having a plan, and following it, doesn't absolve oneself – and to oneself, if no one else – of coming up with a better plan, or improvising, or delegating some or all of the plan, if that's what's needed to stop kids from being bullied or an evil villain from destroying the world (or whatever).
Another way to consider the conversation in the story is that Hermione initially represents virtue ethics:
"I would've done the responsible thing and told Professor McGonagall and let her take care of it," Hermione said promptly.
Harry counters with a rendition of consequentialist ethics.
If I believed you to be a virtue ethicist, I might say that you must be mindful of your audience when dispensing advice. If I believed you to be a deontologist, I might say that you should tailor your advice to the needs of the listener. Believing you to be a consequentialist, I will say that advice is only good if it produces better outcomes than the alternatives.
Of course, you know this. So why do you argue that Harry's speech about heroic responsibility is good advice?
[Originally posted to my personal blog, reposted here with edits.]
Introduction
Something Impossible
The Well-Functioning Gear
Recursive Heroic Responsibility
Heroic responsibility for average humans under average conditions
I can predict at least one thing that people will say in the comments, because I've heard it hundreds of times–that Swimmer963 is a clear example of someone who should leave nursing, take the meta-level responsibility, and do something higher impact for the usual. Because she's smart. Because she's rational. Whatever.
Fine. This post isn't about me. Whether I like it or not, the concept of heroic responsibility is now a part of my value system, and I probably am going to leave nursing.
But what about the other nurses on my unit, the ones who are competent and motivated and curious and really care? Would familiarity with the concept of heroic responsibility help or hinder them in their work? Honestly, I predict that they would feel alienated, that they would assume I held a low opinion of them (which I don't, and I really don't want them to think that I do), and that they would flinch away and go back to the things that they were doing anyway, the role where they were comfortable–or that, if they did accept it, it would cause them to burn out. So as a consequentialist, I'm not going to tell them.
And yeah, that bothers me. Because I'm not a special snowflake. Because I want to live in a world where rationality helps everyone. Because I feel like the reason they would react that was isn't because of anything about them as people, or because heroic responsibility is a bad thing, but because I'm not able to communicate to them what I mean. Maybe stupid reasons. Still bothers me.