I think most of the people saying OP is being unreasonable has misunderstood her point entirely.
She is not saying that it is bad to go back to work. She is wondering how her situation, where it is financially unsound for her to return to work, is different from other people's. She asks what is different about other people's jobs and childcare arrangements.
OP, I don't think you are being unreasonable at all.
I am pregnant with our second child. When it is born, I will have two under 2s.
DH and I both have 'career' jobs. Both have to take place during normal working hours, so shift work is not an option.
Unlike a lot of people who say they 'need' to go back to work, we don't have any family nearby from whom we can have free childcare.
We earn just above the amount that allows you subsidised childcare.
I could go back to work, and might well if I can find a suitable job near here (we moved before DD was born).
So, assuming nursery fees are £80/day minimum for the two children, that is £400 per week. I earn approximately £457 per week. So I would be working a full week in a stressful job, both children would be looked after by strangers (sorry, but even if they are brilliant they aren't as good as you: they don't love your children). I would make £57 per week.
Is it worth it? I don't know. If I were lower down the pay scale, then no. About 3 years ago I would have earned £403/week approximately. Is it worth working full time in a stressful job for £3 a week? How does this really help your family?