That is probably the core of it, whether one wants to admit it or not. There are also the various ignorant talking points about sucking public funds and increases in crime. From legal immigrants its is their disdain that they flouted the law, and that they may achieve what they did through different/cheaper means.
Eh - not a legal expert, but I don’t think ignorance of the law is an excuse. There is due process in processing illegal immigrants. The letter of the law is clear, but DACA was set up because obviously some people thought there should be exceptions.
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