This is good for the American workers
Maybe in some cases yes, but in others it will have little effect or it will put unqualified Americans into jobs they lack the skills and experience for.
No idea what this means or what you're claiming. I think it's neutral for the American people themselves, but it looks good on them.
Maybe in some cases, but it's way more complicated than you make it out to be.
Why should we help the world?
Because we want to continue to be a driver country and not a passenger country? Because it's ethical and we want Americanism associated with righteousness? Because we have a conscience?