Jeffster, I can understand why you think Sarah's approach wouldn't be helpful to educating people who don't know any better, but I think that it did serve a purpose. There really are misunderstood (and sometimes maladjusted) people here who use MBTI mostly to comfort themselves with generalizations that make them feel justified in feeling victimized by a world full of ignorant, unintelligent sensors. Some of them are actually very intelligent, but misuse that intelligence to spread their venom.
This actually happened a lot on INTPc, this place drew quite a few members from there, and despite our best efforts, some of that negative culture found its way into the culture of this forum, albeit in diluted (and sometimes unconscious) form.
The interesting part, is that not everyone is so much a venom spreader, as that they've become entranced by venom spreaders. This is what happened to me. A few intelligent INTPs rationalized their views on sensors, and they earned my respect, and I began to respect and help rationalize their views more because I cared what they thought of me (and maybe to indulge a little with them in a comforting victimization for a moment) than because I thought it was true (often I just wouldn't let myself think about it). Later on, things like what Sarah said here actually guilted me into confronting and trying to adjust my own behavior... probably because part of me already knew it wasn't right.
I really don't envy Sarah's position here, though. She's an ISFP with developed Ni. That means she sees things like this, and the other SPs tell her it's not there or that she's taking an impractical, high-handed approach, while most of the Ns have good reasons to want to deny she had a point (whether consciously or unconsciously), and just casually outmaneuver her in their avoidance. Although you have to appreciate the irony in that part of the reason she finds more fault with us Ns, is because she has started to become more like us.
This is all just an idea, though... can't say that it's definitely true or anything. Take from it what you will.