@cicerone imposter,
Is it actually possible to have the reasonable discussion of the issues indicated by the last few posts? I hope so...
First, the issue that many people don't acknowledge is that illegal people are human beings. They have lots of reasons for staying here beyond work.
People have family connections and community connections. There are illegal people who have grown up in the US since a very young age who would be completely lost in any other country (and some don't even know any language other than English). Illegal people are, in fact, people. As human beings we all know that making life decisions impacting is often more complex than work.
There are several of problems with the "punish the employers" tactic.
First, as noted, putting harsh pressure on vulnerable families probably won't have the "desired" effect. Imagine what it would take to get you to leave the US-- would taking away your livelihood and ability to get services get you to leave?
Second, there are lots of Americans (do-gooders from civil rights groups to churches to simply kind people) who wouldn't put up with their neighbor's suffering. The number of Americans, from citizens to elected officials to law enforcement organizations, who are supporting sanctuary laws in their city is a good indication of the problem. This is, of course, a particular problem in a democratic society where each citizen gets a vote... if you can't make the provisions harsh enough (and you can't because too many voters are sympathetic), they don't have a chance of working. (OK this second point isn't really part of the "punish the employers" theme, but...)
Third, employers aren't going to take it. It is stupid enough to think that eliminating currently productive workers in a struggling economy is a good idea. The idea that raising costs and legal burdens on employers is simply ridiculous.
Of course employers have financial resources which gives them more political clout than the average citizen. This is why no one really takes the "punish the employer" thing very seriously. It is much easier to support racial profiling and raids on workers and idiot get-tough sheriffs.
The "pro-enforcement" fad started by the Bush Administration has done very little damage to employers. It has been very effective at breaking families and enraging communities.