1. the wall was already built there in 2008
2. House values range from $60K to $200k: Primarily snowbirds (they'll figure it out)
3. The new wall you're apparently discussing is just in the planning phase
4. Brownsville is ON THE BORDER, so the wall has to go somewhere.
5. Houses are lost to roadways regularly - sometimes the common good outweighs a few houses.
https://www.kxan.com/news/border-wall-plans-could-divide-south-texas-retirement-community/
Basically you've turned normal infrastructure project work details into some kind of nightmare scenario that doesn't exist.
Typical liberal fake news.