I think that there is a very unfortunate tendency IRL and on this thread to confound 'responsibility' and 'resilience'.
I do agree that a lot of people seem very reluctant to take personal responsibility, and inclined to blame others for everything, though I am not sure that this is worse now than in previous generations. An example which annoyed me is people thinking that Dominic Cummings' breach of lockdown excuses them from following rules themselves. Yes, Cummings is poisonous; yes, this government is pretty rubbish on most things (except surprisingly vaccines); no, I've never voted Tory. But, to use a classic parental expression - if Dominic Cummings jumped off a cliff, would you do so too?! We should be trying to avoid getting and spreading Covid because we don't want to harm ourselves or others, not just because the government told us to! And this is just one example.
However, irresponsible behaviour usually has little to do with resilience. In fact, some of the most irresponsible people are those who think that they're immortal and invincible and won't suffer any major consequences of foolish behaviour (or in many cases don't think at all!). Combine this with selfishness and a lack of concern about how one's own behaviour may affect others, and you get a perfect recipe for irresponsibility.
However, this does not mean that harshness toward people who have mental or physical health difficulties, or just can't cope with certain situations, is good for them or will make them resilient. Often the opposite. Nor is 'resilience' a moral virtue. Nor are most people 'resilient' or 'non-resilient' globally. Most people are resilient about some things and not others (I am very resilient about effort and about waiting for things; I am not resilient about pain.) Nor should resilience be equated with stoicism and the stiff upper lip. Too many people had very stiff upper lips - until their undiagnosed mental health issues caused them to take their own lives.
I agree that it is unfair that the resilient have to prop up the non-resilient; but - as people have said on this thread - life is not fair. The most obvious example that instantly comes to mind is that of healthy people having to care for others with dementia. Which can certainly be very difficult and stressful for the carers; but is hardly the fault of the people with dementia! The same goes for those with mental health difficulties. I realize that in some cases, needing to be propped up is to some extent the result of poor choices (e.g. alcoholism or drug addiction), but I don't think this is true in general.
I think that people's failure to take responsibility for their choices may be more noticeable nowadays because many people are given more choices, at least on the surface. It is a very good thing that nowadays people don't just fall into a narrow slot provided for them: men don't automatically have to become, say, farmers or miners, because that's what everyone does in their community; women don't have to be SAHMs because that's their sex role in life. But the greater choices do perhaps come with more risk of falling through the cracks.
Similarly, it is great that nowadays young people stay in education till 18 and nearly half go to university; but it does mean that some of them need support in doing so. Those people who couldn't cope with challenging exams 40 years ago didn't have to do them. They left school at 16 (a few years earlier it would have been 15) and certainly didn't go to university. It restricted their job opportunities, but there were plenty of jobs that they could do. I think that if we are to expect a large proportion of people to stay in education long-term, we have to accept that this will come with greater need for some form of hand-holding than in the past. Or we can go back to having fewer people in further and higher education (personally I think we should continue with the greater educational provision, but not assume that everyone will be going to college at 18, and provide more opportunities for mature students). But we should not expect both that over 40% of people will go into higher education, and that they will all be just as well prepared and independent as when it was under 10%.
So I entirely agree that people should learn to be responsible and to consider consequences before making decisions. But - as someone with physical health problems and mild disabilities that went undiagnosed for many years and were sometimes treated as laziness- I strongly oppose any attitude that mental health problems can be cured or prevented by harshness and a refusal to 'pander' to the people with such problems.