It is well known that this problem largely has been created by israel itself, due to travel restrictions, moving and allocating restrictions , by legislation, IDF orders and other semi-bureaucratic and effectively oppressive rules and procedures. One could say they are illegal now because they exercised civil rights which they do not have under Israeli control. There is no comparison with illegal foreigners in the US or Europe. We are not falling for it and we are not buying it.
from the article: Fayyad: New IDF orders threaten to empty West Bank of Palestinians