Many people turn a blind eye to the illegal situation, because many people benefit from it. I've known many illegals, and they work like dogs, particularly in construction trades. The employer, even if he pays them the same rate as a legal worker (which he usually doesn't), gets to dodge social security taxes, unemployment taxes, workers comp taxes, health insurance and liability for IOJs. The illegal alien benefits because he gets benefits through welfare and by using the hospital ER as health insurance. You end up with cheaper construction costs, but the savings are offset by higher costs from other industries, most notably, the health care system.
I'm speaking more towards the many thousands of apartment complexes (e.g. around Houston and Pasadena, etc) that due to their age and "condition" are on the tax roles valued at rates comparable to homes ($250k) - yet these same apartment complexes typically house NUMEROUS large immigrant families... thus the $$ paid in school taxes per child is much less than a typical homeowner -
Certainly there should be some form of weighted calculation in taxes that takes into account the likely number of children eing housed - Not just the perceived market value as set by the taxing authorities