they're still taking advantage of the 'key worker from the NHS perk' of sending kids to school/nursery.
I get where you're coming from, OP. Whether or not people are key workers is almost a separate issue; so many people are treating the emergency school provision as something to which they should be entitled rather than thinking about whether it's something that they actually need.
We're in a privileged position where our DS has a parent who is very much a (part-time) key worker in the NHS and a parent who isn't a key worker, but who also works part-time and very flexibly from home (work can be done in the evenings if need be).
We could apply for him to stay in school, but we honestly can't see why ever we would want to. It won't be normal learning in the usual routine - it is just childcare and won't be particularly fun or educational for the kids. As 'normal' school is suspended, he will be looked after at home as, in our circumstances, we absolutely do not need childcare. We're looking forward to having more time in the day to be able to spend with him.
Why would people consider applying for emergency childcare when they patently do not need it - any more than a fit and healthy person would apply for a blue badge or a well-off family would seek a referral to a food bank?
It IS everybody's business if the schools are being closed for the purpose of stemming the spreading of the virus and then people who have no need at all to do so are just sending them in anyway. It's the same principle as the panic buying - it's taking more of scarce resources for yourself than you need, regardless of what your own level of need actually is.
It's quite offensive, really, when there are parents who would dearly love to be able to stay at home to protect and look after their children (and themselves), but can't because they need to staff the hospitals and keep the food supply going, so they take that risk for everybody's benefit; and then there are people who will be at home anyway, not even needing to work, looking on and saying "Hey, I should get a bit of that 'privilege' too!" I wonder if some of them are the same ones who complain because wheelchair users get to park closer to buildings - the 'lucky' people.