Immigrants good for me and you? Bad? How to make a good answer that is accurate?

DWise1 writes:One of the several schemes for how the Wall will be paid for is the claim that by eliminating illegal immigration we can take the money that illegal immigration is costing us and put that to building the Wall, make the Wall almost self-funding.That ignores the tax revenues we get from illegal immigrants, from the taxes that they pay. While "independent contractor" illegals (eg, day laborers, home cleaners, gardeners) can operate on a cash only basis being paid directly by their customers, illegals who work for a company and receive a paycheck need to go through the motions, usually with fake IDs (like the ones that Trump's resorts got for their own illegals). Those illegals get payroll taxes (eg, FICA for Social Security and Medicare) and income tax withholding taken out of their pay. And since they don't have valid IDs, they cannot receive any Social Security nor Medicare benefits, nor (to my knowledge) can they file income taxes to get any refund. Plus all illegal immigrants pay the same day-to-day taxes that we all pay (eg, sales tax, gas tax, property taxes through their rent payments). It turns out that illegal workers pay more in taxes than they receive as benefits. The "cost of illegal immigration" turns out to be a net gain, not a liability -- http://www.ncsl.org/...te-reports-on-fiscal-immigration.aspx.So even if we were to completely eliminate illegal immigration, we would end up losing money instead of gaining. And that's not even including the adverse effects of stores losing customers, landlords losing renters, and businesses losing employees.