Part of the problem here is, as I think has been stated, that people can't always distinguish between someone's learned helplessness - or laziness or whatever the judgement is - and their actual limits. Before I had access to (or knowledge that I needed) certain dietary supplements, my doctor used to admonish me to go out for walks with my dog. I couldn't seem to get her to understand why I couldn't do that, even though she knew of my fibromyalgia and didn't dispute the diagnosis. Once I started getting what I needed, by trying something suggested by a friend, I got out there and started walking on my own. I didn't need to be told to do it. My body got the urge to move, and I gladly went with it. So, the evidence that I wasn't just lying around out of a false belief that I couldn't get exercise was in what I did as soon as I became more able.
The other part of the problem is in the understanding that people aren't just being exposed to a few disappointments in life, from which they learn to give up. Some of us got hammered on over and over, by various people, for years. Given such circumstances, out of what, then, is someone supposed to develop the optimism and sense of control over one's own life to prevent learned helplessness after all that, unless there's appropriate help or circumstances get a lot better on their own? I got lucky, with my mixed bag childhood, and yet I still had a long way to go before I could really learn what my actual capabilities were, even though I had the drive to finally see things through. Some have been luckier than I, some not as much.
Between those two problems and the matter of actually varying capability, which also has already been mentioned, the situation is kind of a mess. It leaves a lot of people looking like they're either lying to get away with doing less than they're able to do or irritatingly whining about their delusions of inability. And not much is worse than telling the truth and not being believed. Ask any woman who's been raped and then told by others that it never happened, that it wasn't any big deal, or that she must've asked for it.
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