Are we really going to blame Romney for the dynamics of the global economy? That's ridiculous. The American economy is healthier because it can move back-office jobs to developing countries, while becoming more competitive internationally, and thus growing to allow for higher levels of skilled employment.
People may have been affected by this shift, but to place that anger on Romney is low and it's dirty.
There is absolutely nothing unethical about moving jobs to developing countries. You use language like 'wreck the lives of...' and 'deprive them of their source of income...' because it suits your narrative. On the flip side, one could argue that to stop that would be to deprive developing economies from actually realizing their potential in the global market and keeping them in the 'third world' so to speak.
From an economic perspective, no government should hinder such exchanges. Forcefully keeping jobs in the country makes your industries uncompetitive and slow to adapt. It's simply bad policy, unless it can be justified otherwise.