No one is, Kimba. The only thing one is blaming illegals for is entering this country illegally, subsequently demonstrating a total disrespect for our sovereignty and rule of law.
The issue of them taking up so many lower paying jobs, is that those jobs, especially with the economy the way it is, are positions that LEGAL immigrants and Americans should be provided the option of taking. If not taken, then its up to the employers to make those positions more appealing to LEGAL immigrants & Americans. No, not by way of a 3 figure income, but potentially raising wage, and/or the providing of other perks.
Allowing employers the opportunity to keep such jobs low paying, and abusing that of the illegal immigrant, demonstrates a total disrespect of the immigrant, and that which makes America the place people want to come here for, to begin with