It seems to me that the main difference in principle between Labour and National-based governments in NZ is an old question of utilitarianism – whether one should work toward achieving the greatest good or toward ensuring the least harm. The two philosophical positions are sketched out reasonably well in the wikipedia article on utilitarianism.
In principle, the difference boils down to a strategy of positive ambition versus negative mitigation. The former sees achievement as the highest goal, and failure as a necessary collateral effect of attempted achievement. They grade a society by its upper bound, by how much success its leading members achieve. In this regard, the ideology emphasises ambition, celebrating that qualities as the most beneficial to society while disregarding the worst consequences of its failure – destitution, disease, starvation, etc. The caricature of an ambitionist, if I may coin the term, sees the world as humanity’s oyster, and humanity in positive terms – as potentially successful and satisfied and healthy and secure, and considers that anyone who does not achieve these things has simply not tried hard enough, or for long enough, or lacks the innate characteristics needed to achieve those things and is therefore not entitled to them. Entitlement accrues to a person on the grounds of their success. In symbolic terms, the way to appeal to these people is in terms of opportunity, advantage, individuality, and the idea of just desserts for effort rendered.
On the other hand, the caricatured mitigationist (to coin the opposite term) grades society on its lower bound, by the extent to which the least successful members of the society are allowed to suffer by the more successful. They see the world as a dangerous, inhospitable place in which the default state is abject meanness, and humanity in negative terms of limiting those inhospitable forces, keeping out the cold and the hunger and the disease, while anything else is a bonus. Entitlement accrues to a person on the grounds of their humanity alone. The way to appeal to these people symbolically is in terms of compassion, brotherhood, sacrifice, cooperative achievement and that principle that none should suffer needlessly.
Although it may sometimes seem so, the world is not made up of caricatures, and this is my round of defence against complaints of false dichotomy. Both of these two broad positions hold some resonance for each of us, and it seems plausible that the balance of that resonance has a strong determinant effect on our political preferences. The problem, as always, comes with implementation, and the primary problem of implementation in the society we have is that money is used as the main measure of success and therefore as a proxy for a person’s innate value. This is perfectly acceptable to the ambitionists, whose ideological basis enables them to embrace money just as easily as they might embrace any other measure of human importance, but it’s not so attractive to mitigationists, who argue that entitlements accrue to a person on the grounds of their innate status as human beings and members of society, regardless of their achievements.
Push comes to shove at times like this, when things (in terms of that prevailing measure of success, money) are tight. When many people are deprived them, the human necessities of health, comfort and dignity can more readily be achieved by an idea of the common good than by the burning desire of ambition. However, when things get good again, it’s a terribly hard ideological position to peel back, and inasmuch as the common good can constrain the urgency of effort required for success it can be counter-productive, entrenching mediocrity. Indeed, without the incentive of individual reward for ambition, it could be argued that society would never pull out of any trough. But contrary to what the Randroids say, this isn’t an absolute constraint. In good times it’s easy to emphasise the greater good because a reasonable minimum standard can be expected to exist or be trivially provided for the few who need it. None need suffer except by a relative standard. In hard times, however, when raw success is less achievable, mitigating harm at the temporary expense of ambition becomes more valuable by its easy achievement.
The case in point is the Key government’s recession strategy, which gives a great deal of consideration to maintaining ambition but little to mitigating harm. It’s a tacit acceptance of a certain amount of harm in service of a longer-term good. If not from the policy itself, you can tell this from the terms used to talk about it. That’s a complicated philosophical and utilitarian question for a supposedly non-ideological government to be tackling.