Not directly, but we all benefit when we open the borders to this wonderful land to people who love this country so much they want to make it their home.
No, we don't. Open borders allow those who want to destroy us to waltz in along with those who want to make this their home. There is no reason in the world for us to allow anyone who wants to come here to immigrate. Open borders are a disaster, no matter what sort of flowery rhetoric is attached to them. Promoting open borders in time of war is treason, too. Allowing enemy operatives to come and go as they please is definitely giving aid and comfort to the enemy.
I would suspect most illegal aliens don't care too much about this land, but rather the money they can get here through work, welfare, and free education and hospital visits for their kids. Most are not coming here because they love this country, but rather they are coming here for the handouts we offer them. If they truly loved this country they wouldn't be trying to sneak across the border. They would come here the legal way only.