They don't pay taxes, they sign up for our benefits, and we pay their way while they take our jobs.
Our government is the cause, redistributing our wealth to them via income taxes while the income tax on us guarantees that they stay gainfully employed as day laborers undercutting our wages.
Then we get taxed, they don't.
It is not their fault. It is our governments fault and the cause of illegal immigration is the income tax on Americans.