"It is not a corporation's job to provide an unskilled worker skills to do a job they are not qualified for."
This is absolutely wrong. Corporations take these chances every day and they most often pay off.
It's not their "job" to train workers per se, but they would be stupid to neglect the ability to get quality employees for far less than they are potentially worth.
When a corporation takes a chance on a worker they are investing in the worker. Someone with zero skills is a high risk investment. If it turns out the worker is lazy or is not smart enough to grasp the concept of what is being taught him then they will still have an unskilled employee on their payroll that is not productive and will not be able to get a return on their investment.
A corporation will likely be able to pay someone they will train a somewhat lower wage. If the employee they are training is very smart and can do what is being taught them very well then the employee can take those newly learned skills (that the corporation just paid for) and go to another company that can offer more money.
It is a lose-lose situation to hire and train a no-skilled worker for a job that requires skill