Apple is a corportation. It is not "arrogant" and It does not have to be "grateful" to anyone.
If you would like the tax rules changed, complain to the government. No point in getting angry at apple for using the existing loop holes.
What do you want them to do, distribute the 100 billion dollars to every family in the US? They are clearly saving it to make strategic purchases and future R&D.
As for moving the manufacturing to the US, it is impossible to manufacture in the scale and volume needed to keep up with the demand for apple products here in the US.
About the working conditions - it must be so horrible that thousands of people are lining up
to get a job a foxconn. Clearly it must be one of the better jobs out there in China.
Wait till apple replaces all these workers with robots, which will happen sooner than you might think. Maybe all the complainers who are sitting in their comfy western homes and typing in their made-in-china computers can provide them with jobs then.