They are in the US illegally. It's not just people in Michigan and Illinois that don't like it. If you are here illegally you should not be able to reap the benefits of state citizenry.
Why not? That's just a vacuous bumpersticker type slogan for those unable to think for themselves.
Texas wants it's workforce to be as educated and productive as possible. It doesn't help us to educate Michigan kids.
Texas residents pay Texas taxes that are used to pay for Texas colleges. Michigan residents don't contribute one penny to the costs of our collages.