Yea, I find it a little funny (in a sad, depressing, sort of way). We have a short memory as a country/culture. Most people today don't realize that these are the exact same arguments slave owners used to use to justify the continuance of slavery (and, almost certainly, then used to justify the sharecropping system after slavery was ended). Instead of "I can't find American's to do the job", they used to argue "I won't be able to find a white person to do the job". It's all complete bullshit.
The simple fact is, if you're not paying someone enough to live off of and/or you are putting them in a work environment that will literally destroy their body over their career then you are just vermin living off the misery of others. A great example of this was, a while back, when Steven Colbert spoke about illegal immigration in front of a congressional committee. It was posted to YouTube because it was a rare opportunity to hear him speak out of character but what really got my attention was the gentleman who spoke immediately after him. The guy in question was an illegal immigrant rights/labor activist who was there to protest the horrible working conditions (extreme temperatures without adequate water; poor medical services in case of emergencies such as heat stroke or heat related heart attacks; too many hours of work to be healthy; etc.). You know, all those things that make these into jobs "American's don't want/won't do"... It's not that the illegal immigrants want to do them (in those conditions and at that pay) any more than the Americans do, it just that in the case of the illegal immigrants, the farm owners can prey on their higher level of desperation.