Because Mexico doesn’t have heavy machinery on their side.
This is what I do anon.
It would be nothing for me to get that exact same machinery from trumps twitter of the wall being built on a couple of trucks out into the Mexican desert.
Logistics…pffft
Hell they could get that machinery to the fence take it down and say fuck it and abondon the machinery, they wouldn’t give a fuck, the cartel has access to billions of dollars.