Let's set aside politics for a moment and apply some common sense to this birth right thing.
Consider America as your home, with the border representing the walls, windows, and doors of that home.
Imagine, if you can, and entertain this analogy:
You and your lovely family decide to open your doors, believing that you're in a better position than most and there are many without a home or living in poor conditions. You think you're being kind and generous, so you welcome others in.
The first few days might go smoothly. Some in need enter your home, you provide them with food, help with their laundry, and give them a book to learn how to navigate this new environment, to become self-sufficient and proud in their new refuge. But, as they say, no good deed goes unpunished.
The next morning, you find your home overcrowded, things are missing, the pantry's empty. You check on your family, and little Susie's crying because someone was inappropriate with her. You call another family meeting, and despite some reluctance, the majority still favors keeping the doors open.
However, the following night turns sour. You can't find Susie, valuables are gone, and the newcomers seem indifferent to you and your family, even threatening you. You retreat to the basement with who's left of your family, decide to evict everyone, and lock the doors behind the last person to leave. Now your home has a strong border.
In the subsequent week, you learn that a couple managed to break in through a window and had a baby in your bathtub. Now you're in a bind, because she broke in and gave birth there, she's allowed to stay, no matter her character or potential danger to your family. She can bring her partner and extended family to live with you indefinitely. As frustrating as this is, it keeps happening because it's become known that if someone can break in and have a child in your bathtub, they get a permanent place in your home, with access to your resources and protection.
Does this analogy work with anyone? Of course, the left will argue this isn't an accurate parallel. If that's the case, please explain why it doesn't fit, and tell me which part specifically doesn't make sense.