Laws are rarely fully or evenly applied. Even if the law says something must be done it might still not be done. For example there are many thousands of people

Laws are rarely fully or evenly applied. Even if the law says something must be done it might still not be done. For example there are many thousands of people every year who are not allowed to be in the US but who self-identify as working in the US by paying income tax. By your logic they would be deported. Mostly, they are not.