Legal immigrants are acceptable. The country knows who they are, where they are from, why they are coming, how long they intend to stay, and other vital information. Illegal aliens are like burglars who sneak orbreak into a home. The country has no idea who illegal aliens are, where they are from, why they are coming, how long they plan to stay, and other necessary information. Illegals are more likely to be uneducated, filthy disease bearers that can pose a grave threat to a country's health and security.