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why is it necessary for the state to be involved in all areas where human welfare is at risk?
The part of this definition I challenge is "all areas where human welfare is at risk."
This is too broad of a statement, and human welfare is not defined.
Does this include the bailout of airlines to save jobs (or maybe executive pay)? I don't think that is a liberal ideal, or if it is, the Republicans share it.
Does this include federal pork to the states to create jobs? Again, Republicans fully support pork to the states in the form of military contracts.
Let me try to narrow down the meaning of "human welfare" and the role that government has within civilized communities. Human welfare, by my definition, involves the basic needs of a person: food, clothing, shelter, education, health care, transportation, communications, recreation, and work. I have expanded these basic needs from the classic ones of Maslow because our civilized communities require all of these in order for a person to be viable.
Food, clothing, and shelter are partially provided now at a minimum standard. However, without education, a member of society will not be able to find work that will provide the other needs (health care, transportation, communications, recreation). Note that the educational requirements for work have expanded past high school since the dawn of the "information" economy (IE), for lack of a better term.
What should government's role be then? Education is primary. Everyone who wants education should be able to get it, period. Without education, work cannot be found to fulfill the other needs. The government must guarantee that everyone can pursue education to their highest potentials because without out this, the IE does not work. As it stands now, fewer people can afford education without amassing large debt, and the education system itself suffers from very old problems about prestige. The government's roles and goals should be to reform education.
What good is education if there are no jobs? The government's role should be to encourage job growth through R&D funding. I'm also in favor of research/publishing grants to independents
Public transportation has been put into place with varying successes. The government's roles should be to promote and provide better public transportation.
Communications is squarely on the shoulders of government. We need broad band to every place, including wireless for remote area access. This is currently regulated in a manner that restricts access on the short-haul by maintaining regional monopolies.
Free enterprise has brought us congested highways, suburban sprawl, damaging growth, inefficient use of human resources, dependency on limited fuel supplies, greater class stratification, periods of serious job loss, homelessness, family breakups, and even dubious wars.
My liberal belief is that government has big responsibilities to the members of our communities--this is why governments exist to begin with. My liberal belief is that the vast majority of community members want to achieve their highest potentials, work at well-paid and interesting jobs, pursue their own good ideas, and contribute to the general welfare of all community members.
I, of course, am a dreamer when it comes to this positive outlook on human nature, as witnessed by the most recent thefts and scams committed by corporate crooks. My idealism is also negated by the greed-infested illegal drug markets, the grossly huge prison systems this has brought about, and a general feeling of "everyone for her/himself" attitude.
Guess we don't deserve the kind of government I've described.