Consume Product

They just prefer low-hanging fruit. Trying to go into an encampment with 5000 illegals to attempt to detain and deport them is simply dangerous. If they start fighting back they are proper fucked. They'd have to go in probably 1000 strong, would have to have transport available to actual transfer that many people, they have to have somewhere to put them. Logistically, it's a huge problem which is why they go after smaller groups only. Safety in numbers.... One could argue you could use the military, but there's probably some restrictions on deploying the army.