Mine's going in because both DH and I WFH, not the sort of jobs where it's straight forward to split our time between that and childcare.
During Lockdown 1 DH ended up working 5am to 2pm and I worked 2pm to 11pm. Though he'd have the odd meeting during my working hours, and I'd often end up working until after midnight. We did it because we had to, but it was a genuine struggle, not sustainable, and we desperately missed things like eating together as a family (not to mention it felt like we were gently failing at both parenting and working).
We could survive with only one of us working, but it would significantly change the way we live our life (financially) and be hard to get back into our industries after a break. I do consider it, but I believe I'm more use to society as someone who has the income available to spend, esp if we're heading into a massive recession.
DD also LOVES nursery. So there is social and happiness benefit to her too.
If I wasn't working, I'd probably continue to send her, but for fewer days a week, and I'd probably keep her home for the next few weeks while Lockdown starts to 'work' and cases start to fall.
I really do see this next 8 weeks as the darkest part of the night before dawn, we have the vaccines, we know how to lockdown to stop the spread, Spring is coming, we just need to knuckledown for the next couple of months, and I hope things will be brighter.