They aren't; it's true. I mean, unless you are a strawberry picker or day worker who hangs out by Home Depot looking for work.
The problem with undocumented workers isn't the fault of the worker, it's the fault of the employer hiring them regardless of their citizenship status. If your local Pizza Hut hires a few Mexicans to cook pizzas instead of college kids, that isn't the fault of the immigrants for taking the job.
There's a problem with the system and cracking down on employers who hire undocumented workers, not a problem with immigrants trying to make some money to get a better life.
Thoughts?
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So basically you're ignoring the fact that those are jobs that could have been taken by Americans, but are taken by illegals, and your justification for this is that they're bad jobs. And you also ignore he fact that those employers wouldn't even be able to give an illegal immigrant a job if they didn't come illegally in the first place. Great logic. /obvious sarcasm