Answer: Those who have green card status have entered the country legally. They must wait 5 years before you can even apply to become a US citizen and 3 if you are married to one.
Why should someone who entered illegally be entitled to citizenship quicker than someone who has entered legally? There should be some provision for helping those who have entering illegally if their status at home would put them in danger, but immediate citizenship is not the way.
The question is complex and the answer even more complex. Help but don't rob those who are legal residents.
