Earlier quoted context omitted.
ICE doesn't protect the border, that's United States Customs and Border Protection (CBP). ICE are the goons operating everywhere (i. e. not tied to the border) rounding up "suspected illegal immigrants". Because it isn't exactly hard to find illegal immigrants, and their charter allows them to control people without objective cause, ICE gets to arbitrarily decide whom to harass. It's the real-life version of the pere…
ICE is the enforcement arm for immigration , which handles people who cross the border. Obviously if there's a strong border then there's no problem in the first place. As for the rest of your comment, this is the far-left extremist position that I cited in my first post. There's no good faith discussion to be had here.
No, it's the enforcement arm for immigration and customs, the former of which is people who are living in the US despite not being US citizens. Enforcement of people (and goods) crossing the border is the Border Patrol and it's parent organization Customs and Border Protection.