Here's the part of 'Illegal' I Don't Understand

What part of the word "illegal" don't I understand?

I don't understand the part about why coming to America should be illegal, or the part about why joining family members here should be illegal, or the part about why it should be illegal to work, even when no one else wants the job.

I don't understand the part about having a welcome sign at our country's entrance, saying, Give us your huddled masses, yearning to breathe free, but when they arrive, we tell them to seek their refuge elsewhere.

I don't understand how it is suppose to be patriotic to oppose these people when one of the reasons listed in the Declaration of Independence for declaring war is that the king was restricting immigration. 

I don't understand how one of the freedoms this nation once enjoyed was the freedom to come here, but now it is not.

I don't understand how locking people out has anything to do with freedom.

I don't understand the part about them being normal, simple, everyday people as long as they stay in Mexico, but if they drift too far to the north, they become fierce criminals, capable of destroying our nation if allowed to remain.

I don't understand the part about how poor people coming to America qualifies as an invasion.

I don't understand how it is that the Declaration of Independence speaks of certain inALIENable rights, yet the only people we won't grant those rights to are called, coincidentally, aliens.

No, I don't understand word one about it, and since there is only one word in "illegal," I guess that means I don't understand the whole of it. What part don't I understand? What part do I understand?!