I have usually found mumsnet quite sensitive to the position of the poor and vulnerable in the past but since covid a lot of people seem to have lost sight of the fact that not everyone has a comfortable or even safe home; not everyone can afford enough food for a week at a time or even for a day; not everyone has the education level required or language skills to understand complex and ever changing rules about how many people you're allowed to meet in a park etc; that for some a shop or pub closing is an inconvenience but for others it is their livelihood gone.
It's easy to care about others when it's not really costing you anything. Very few people actively want to see lots of suffering, and if you could help others in some small way without compromising your own safety and security then why wouldn't you? But as soon as you introduce some existential threat, whether that's a potentially deadly or disabling disease or the prospect of poverty/isolation/non-covid related health problems, that changes the balance significantly. It takes a very very selfless person to advocate for their CEV partner or child locking themselves indoors for months on end or facing an increased risk of death, in order to avoid plunging tens of thousands of strangers into homelessness and starvation. Equally it takes a very very selfless person to advocate for their own destitution and isolation, in order to indirectly reduce a risk to tens of thousands of strangers that on an individual level is already very small. I just don't think there are many people who have that degree of objectivity and altruism, though I very much admire anyone who does.
The thing that makes me angry is that this narrative has somehow emerged among a small but vocal contingent, that condemning people to poverty (other people, naturally) is the virtuous option, in order to protect those who are vulnerable to covid. It's not - it's the selfish option, from the point of view of those who are more worried about covid than they are about the side-effects of lockdown. Of course, if you or someone you love are clinically vulnerable then it's entirely understandable that that's your biggest priority, but it doesn't make you any less selfish than those whose biggest priority is being able to feed themselves and not be made homeless. (And before anyone argues that death is objectively worse than poverty, ask yourself why you haven't sold everything you own and used the proceeds to pay for cheap anti-malaria measures in developing countries. You could save a lot of strangers' lives that way.) I don't know whether lockdown was the right or wrong response, but people being all holier-than-thou about wanting lockdown because they "care about their community" is getting so, so old.
So yes, it is quite galling when those who've spent months advocating for ever-stricter measures and the selfless destruction of other people's livelihoods - and I don't mean you OP, I have no reason to think you were one of them and I'm glad you've highlighted this issue - act like it's a terrible shock when they're confronted with the reality of what they were asking for all along. Especially when the people who are actually in that position have been trying to make themselves heard for months and getting talked over or ignored. It's akin to people pushing for no restrictions at all, then being shown the resulting footage of patients dying in hospital corridors and going "oh no, I didn't mean I wanted that".
Incidentally, anyone who thinks "we're all in the same boat" should watch the program and then have a read through the "terrible pandemic secrets" thread. The contrast is stark.