This article is not based on anything resembling fact, so it cannot be used to form an opinion about illegal immigrants. It was written by someone (or probably a combination of people over the years) with a strong bias against immigration in general, legal or otherwise. It tries to incite hatred against people from other countries. According to FactCheck.org, it claims to use as its source several articles from the Center for Immigration Studies (CIS), which itself has a strong bias against immigration, but even CIS denounces this article as “a chain email that is in no way scientific”. Furthermore, the original article was published in 2007, so it should have been taken down many years ago since it has been thoroughly discredited.
The intention of this article is to make people believe that immigration in general is bad. It constantly combines statistics about legal and illegal immigration and tries to paint all immigrants with the same brush. And the reason it does that is because it is trying to make a bigger point. This article is not about illegal immigration, it is about encouraging nationalist and xenophobic thinking. Look at how it says that most of these illegal immigrants are from Mexico and then says that public schools have “thousands of students speaking 41 different languages” and later “over 100 languages”. In my experience, people from Mexico speak Spanish. Who is speaking the other 40 to 99 languages this article refers to?
The gist of this article is that people from other countries are bad. They are probably terrorists. Languages besides English are bad. Foreigners cause all the problems in the US. Therefore, if you just deport all of them, everything will be fine. Everyone who remains will be nice and white and law abiding.
The point of this article is not to educate you about illegal immigration, it is to incite you to hate foreign people. Therefore, it cannot be used to start a reasonable conversation about illegal immigration until and unless all participants in the conversation agree on that point.