First, the Department of Health and Human Services has an annual budget of > $US 1.8 trillion, or a little over $US 5,000/year on a per capita basis.
Note that this doesn't take social programs administered by other departments and agencies into account (e.g., the Department of Education, the Veteran's Administration, the Social Security Administration...). Those also do a great deal of social spending (especially Social Security).
While this is probably not as high as the EU on a per-capita basis, it's quite unfair to characterize it as "no" safety net.
Also, I find Galloway's argument that older people are too unhealthy to move back to Denmark (or wherever)... unpersuasive. You can be pretty damned unhealthy and still get on a plane nowadays.