These folks simply do not understand that the underlying goal is to drive U.S. wages to third world levels by introducing large labor surpluses.
It is unlikely that any surplus of labor would lead employers to pay significantly less than the productivity of a worker, especially in sectors such as computer programming where barriers to entry are low and new firms can rapidly form.
It is possible that labor surpluses could actually lower the prices of goods and services in general, which can benefit consumers.
for those who talk about expanding the economy to accommodate millions of new workers; how's that working for you?
Research suggests that "U.S. natives (especially high-skill natives) appear to have benefited from greater availability and reduced prices of nongraded goods and services that are intensive in low-skill labor"
Complimentary labor from low-skilled immigrants makes things better for high-skilled natives, although it may have a small negative effect on the earnings of low-skilled natives (especially those that drop out of high school).
BTW, I know several women in tech fields who only have the opportunity to work because of the low cost of services from immigrant nannies for their young children, immigrant house cleaners, etc.