Well, they do take jobs that others here legally might have. Illegal aliens do not go through a process of legal citizenship that legal immigrants must go through. They do not pay taxes and yet live here and benefit as if they did pay taxes. Some (more than some) commit crimes (anything "illegal" is a crime) and some (more than some) are involved in criminal gangs.
What a question!! Illegal aliens are not eligible for income tax refunds.
Up to date, four. Illegal ones, ET, Alien and Predator.
In this dream, the "aliens" probably represent persons or forces from outside the dreamer's area of familiarity. If the dream involves space aliens, there might be a pun on "illegal aliens" - undocumented immigrants - that are the focus of so much political attention and abuse.
how much money do taxpayers pay in expenses created by crashes
An illegal alien cannot legally be, or reside, in the United States; much less hold political office.
To dang much
The DHS costs taxpayers about $56,018,032 each year.
A lot of dough?