I favor spending the money on drones and fast response teams. When the drones or fast response teams get these people back to their side of the border quickly and without ICE involvement the word will get out. And no I'm not calling for lethal interdiction but tear gas and rubber bullets can sometimes have consequences.
That’s a good idea. As it is, though, there are sensors, cameras and other security all along the northern border. Canada contributes much to that security. Even rural neighbors on both sides of the northern border go through nearby small checkpoints. I would not want to try to cross that one illegally these days. Canadians, on average, are economically well off.
The Mexican border is different in many ways. Mexico is not much help with security. Few people want to work along that border for any great length of time (extreme heat, unappealing landscape, lack of infrastructure, lack of services, etc.). Employer lobbies make the situation even more futile. Employers and managers love the resorts. They get hordes of slaves through one way or another. Extreme poverty in so many countries south of the border is a strong motivation.
Look at Europe. There’s a big rush on from Africa, Syria and other hot places. With word from the Internet and rumors about wealth and women, enormous numbers of southern people are pressing toward northern Europe.
Here’s something that many are not realizing. Wealthy philanthropists/slavers and the Internet are a couple of the main culprits.