I'd like to say that the whole issue of illegal immigration has been mishandled -- by everyone, including conservatives. The issue is the rule of law. Do you want to live in a safe community where people voluntarily obey the law? This is not only about American citizens' fear of the crime levels associated with large numbers of people living in the shadows, where they won't report illegal activity (even perpetrated upon themselves) because they themselves are breaking the law; this is also about asking those who have come here what sort of society they would like to live in. Wouldn't you like to live in a place where you don't have to be afraid of both those who would prey upon you (the criminals) and those who are supposed to protect you (the police)?
The only way to build a community upon the foundation of law is to enforce the law. The more you enforce the law, the less heavy-handed you have to be, because most people will see its benefits and voluntarily obey the law. Then the police only have to deal with the minority who refuse to obey the law. That means, in the last analysis, sending people home who have entered illegally or outstayed their visas.
If you don't like that, then let me remind you that Congress has the power -- has always had the power -- to change the number of people to be admitted from any given country or region, or to alter the entry requirements across the board. That they have so far refused is either a) the will of the American people or b) a desire on our lawgivers' part to continue to hamper the enforcement of their own laws. The first should be respected; the second should result in a new Congress. Likewise, the President, as Chief Executive, is charged with enforcing the laws -- all the laws. Why are the immigration laws not enforced? If we decide that they are simply unenforceable, because the people at large will not obey them (think of the failure of Prohibition, e.g.), then ask Congress to change the laws -- but the President is not let off the hook while Congress dithers. Not enforcing the law is not an option. And if you think the law unjust, then the public spectacle of enforcing an unjust law will surely galvanize public opinion to see it changed (think Gandhi's or ML King's social justice provocations).
But no, a large number of people -- not just liberals, who like to pick and choose which laws they will obey and enforce (liberals are natural aristocrats), but even our government -- have CHOSEN not to enforce the laws as they exist. In the long run, this is a recipe for social disaster. If you want to see what that looks like, look at France, which has large, no-go areas (mostly inhabited by Muslims), where the police do not enforce the law. Britain is on the same train, though a station or two behind. Crime flourishes, riots intimidate the government, people are made into victims, the country grows weaker as a whole. It is a fine thing that people should escape the Third World to find opportunity in the West, but they must learn the ways of their new countries. Turning their new country into like what they left cheapens what they hoped to gain, as well as spelling disaster for those who already lived there.
So: If you don't like the laws, change them. But simply deciding that there are laws that we will not enforce leads to the worst of all worlds for everybody, including immigrants, documented or undocumented.