The reason I posted into your American debate is that we have the same thing happening across Europe; open borders, immigration issues and terrorist threats. The reason I posted that immigration has been success for America is because that's what it is. Immigrants who do not follow the law and arrive in a country undetected is a real cause for concern but at the same time there is no doubting they contributes to the economy even though such employers are breaking the law by employing such individuals.
Immigration across most countries (including the US) has been happening for years before policies were formulated and put into law. Given that immigrants are protected by law irrespective of their status in most countries the cost of reformation is significant to detect those individuals who bypassed lawful enty method, to prevent them from entering across open borders in future, deporting that person or actually that person becoming a citizen.
In the US the Federal and state governments in respect of the fourteenth amendment indicates that needs to ensure it does not "deny to any person within its jurisdiction the equal protection of the laws.", so in a nutshell that person is legal under the law even though they did not comply with immigration entry requirements. So when an immigrant arrives the law applies to them, a more apt term is an
undocumented immigrant rather than illegal but most people use the term illegal. Most documented criminals have legal status but yet they undertake illegal acts such as murder, rape and lower type crimes. Trying to use the wide brush stroke and imply all immigrants fall under this category is incorrect, that's not saying immigrants do not have the capacity for illegal acts but it is likely that the majority come to work and/or better the lives of their families.
There is proportion of the population in this country that are capable of working but a significant number of these would rather not take up low paid work in favour of state handouts, scam the state and/or even worse undertake illegal acts to make money whilst causing misery towards others. There are people who have no intention of working like the rest of the population yet they [female dog] about immigrants who live and work here by stating they are taking our jobs. My reply to them is either “put-up or shut-up”. If an immigrant was better suited to a job and was given it than myself it is likely to mean that they are better suited for the job, it happens, live with it.
Personally I don't agree with immigrants arriving without the necessary paperwork but unless a government (irrespective of country/political party) is willing to invest heavily in law reformations, border security, resources and the power to enforce the law then it will continue to happen. Not only does the UK have their own laws but we have European law to adhere to which further complicates things over here and this applies to a lot of other things which is in my opinion highly beaurcratic and often detrimental to the society/economy I live in.
Good luck to you guys in the US getting the immigration mess sorted-out.
Kren