I'm one of these women, working with young DC, to break even financially. It is hard.
Most women nowadays do it, as there are so few secure jobs & industries nowadays. So being reliant on one salary is too much of a gamble. Although it can be tempting to SAH, especially with all the stress of commuting, work, trying to juggle DC & home, it's just not feasible nowadays for most.
And if you take time out to have DC, you rarely/never get back in again, certainly not at the same level. If you've been to university, and built up a career until your 30's, before having DC, it's a lot to throw away. A friend of mine is an accountant of took a 5-year career break from KPMG. Unsurprisingly, at the end, her old job no longer exists & she is out of work.
Plus 2 salaries are generally needed for housing costs. Gone are the days of a nice house on 1 salary. That's why most women continue working, but many give up as you have to earn 35-40K to pay for 2 places. Round here it's £100-120 a day for 2 places, and £20/day for wraparound school care.
If the government wants to get people in to work, and contributing taxes to pay for current pensions, the NHS etc, then subsidising childcare would be a great way to do it.
On a separate note, I'd happily pay more taxes for public services & the NHS.