Trump's Wall in Arizona

The reason the bydon administration gave for building trump's wall in these sections of arizona is because they're saying it's dangerous for migrants to cross the river there. And so they want to put up a wall to stop the people from crossing. But now they're saying that walls do stop people from crossing, yes, but they're only doing it here because they want to make it safer,. So they want people to try o cross here other parts, i guess. Although if you really wanted to make crossing a river safer than why wouldn't you just build a bridge? Cus the value oaase it's bulshits. That's why lear is desn't make