Obviously Prop 187 included public assistance, but the crux of its unconstitutionality is due to the fact that IMMIGRATION CANNOT BE DEALT WITH BY THE STATES.
All taxpayers subsidize churches via tax-deductible donations and various religious exemptions from taxes, while reaping the benefits of a tax-payer system.
I don't understand why your argument is so Illegal-specific. Nobody should be in America to commit crimes. People come here legally and natural citizens commit crimes all the time.