@flan
I would argue that nobody can answer your first question as it encompasses an entire country with different kinds of people, different standards of living, different jobs, skills, ages, etc... I can't imagine you could come up with an answer to this... and we don't have to, it's the magic of the market
stocking shelves? if there is a demand for this and a surplus of supply based on the skills required... I would imagine a job like that would pay very little, but if it paid too little, nobody would do it and the wage would increase ~ isn't that beautiful?
how valuable are skills? the market decides... the only fair way... and by market i mean competition

should people who choose low skilled jobs be able to make a living? that's a broad and leading question. if I choose a job that is so low skilled that a machine can do it... should I be able to make a living? should that machine be illegal? should we sacrifice innovation for security? should we all walk as fast as the slowest person? do we live by the lowest common denominator? does providing a minimum living wage encourage being low skilled?
are we forced to take care of and worry about everyone? well yes we are... taxes.
when we are forced to love everyone... love becomes meaningless.
is it my job to plan the lives of those who refuse to plan for themselves? is it anybodies? should it be? i want plans by the many, not by the few.
these questions all lead to education... you tell people you can make a living with no skills, they get no skills and expect a living. then when society moves forward, their no skill jobs are replaced by machines... who do we blame? do we drag those along who refused to take care of themselves? who refused to better themselves? to what extent? to what extent are people responsible for themselves?
don't legislate, educate!
and I'll argue that the best way to help people is to lead by example! you can't help someone who isn't willing to accept it! think about it this way... you walk around telling people they should be like you because you are successful. most people will give you the finger.... but if you act confident in yourself and just let people see how successful you are, they might look at you and be like 'damn, she has her stuff together, I want to be like her' and they might get off their butt and help themselves! what message are we sending people when we reward them for not talking responsibility for their own lives?
this reminds me.. anybody see the movie idiocracy?