The government is corrupt. The government has conspired to commit, aid and abetted a massive fraud against the tax payers, failed to uphold the Constitution are failed to perform their sworn duties. This is clear, and those involved should be held responsible, criminally prosecuted and imprisoned.
I think Corporations profit most and share the greatest portion of the blame. The Democratic party, who see illegal immigrants as future (and current) voters shares the blame. The Left in general, who see them as part of their anti nationalist agenda share the blame. Guys who just want to get their houses painted and lawns mowed for cheap share a small portion of the blame too. There are a lot of different people and agendas exploiting the issue for their own interests, not just the government.