Karma- I think this is something people fully 'get' but just don't agree on.
To many people, the principle of taxing people as individuals is highly important on many levels.
Put this into the wider historical context.
One thing that's cropped up on this thread is people thinking the govt are undermining the traditional family set up: dad earning, mum staying home. I think what the govt IS unashamedly doing is recognising that this is the 21st century and women are just as capable of having the same earnng power as men. (and equally men are just as capable of nurturing)
Yes, they are 'rewarding' (for want of a better word) Family A: two parents who both earn decent, similar incomes, more than Family B: where father earns the equivalent of Family A and mother earns nothing. It's not that we don't understand that- it's that many of us don't have a problem with it. First, because Family A are generating work because they'll be using a nursery or child minder, and also have all the costs which go along with that, whereas Family B dont need to pay for childcare. But another, broader reason is that this reflects societal changes about family set ups, and equality between the sexes.
Those of you who, like me, have a daughter and a son. Hand on heart, do you honestly look at your dd and assume that she won't be capable of earning as much as man? Do you assume her role in life will be to support a mans career? And do you look at your son and assume that he will have to have a high flying career to support a wife at home? Because I don't. I think the expectation that women can earn equally to men is great. Who honestly wants to hark back to the days when it was just assumed that women wouldn't have such opportunities
As I keep saying, this is by no means anti SAHM because if you want to be at home and your partner is happy to support you then that's up to you. But it doesn't mean that you cease to be an individual for the purposes of tax allowances. You are a separate person from your partner.