I would debate that, though, by saying your claim is only part of the truth. What about Mexican government? What about U.S. needing oil from Mexico? Global economics play a part. The one big happy North America is fast becoming an accomplished fact. But I digress.
I do blame the illegals for their craftiness, their attitude of gaming our system, draining our resources, and complete refusal to assimilate, to honor and respect any of our ways. They are only on the taking end. They laugh at all our laws. They are coached in this attitude by Spanish-speaking radio.
Not only are they aided by laissez faire politics, but are actively enabled by all who "hire" them. In fact, I would say they enjoy the most complete support system of any nationality that has come to our country.