OP it's a complete no-brainer. Nobody would do anything differently and work more for less money. Nobody.
People on UC all the time make decisions on working hours because working more would make them only marginally better off. And this is when they are weighing up earning more money themselves versus claiming more money from other taxpayers like you, if they choose to work less. I understand the withdrawal can be up to 67% for them.
People earning £50k are faced with similar choices. Again, almost all (obviously) choose not to work more to earn less. The withdrawal can be up to 80% for them. So obviously also a perfectly rational decision.
People earning £100k are faced with an even more stark choice: work more and lose £27k of net pay for earning £1. The idea that anybody would say it's immoral to choose not to do that is beyond my comprehension. When in fact this decision, unlike the people on UC, involves you still funding everything yourself AND continuing to fund a great deal of the extra support for other families: their rent, living costs, healthcare, their children's education. But you're immoral apparently for not working EVEN MORE, to pay even more to them and make your own family poorer than you are now?!?
Either the respondents saying this are really unintelligent, or have some kind of disability with basic maths, or are completely delusional.
Whichever it is, it matters not. It's not your fault how the system is designed. Obviously you are making the right choice. The only choice really. How would you look your children in the eye and tell them you decided to have a lower income so that you could spend less time with them?
You will still be supporting a very large number of poorer families through the large taxes you'll still be paying, and a little more gratitude for that wouldn't go amiss.
In the meantime, as more and more of our most productive workers who pay for the services and welfare for everyone make the same choices as you, perhaps eventually the message will get through to politicians that they need to fix this, then in the future sometime it may be worth you working more again.
For now, enjoy the increased work/ life balance and time with your children. You've earned it many times over.