The question is not
Can we control our border without a wall, but
Will we?

border-agents...
Border Patrol agents are issuing Notices to Appear, consistent with law, regulation, and the department's enforcement priorities. Judd said there was an insidious plot laid by drug cartels as they helped children cross the border, asserting , "The unaccompanied minors could have walked right up to the Port of Entry and asked for asylum.

Border Patrol told to stand down in Arizona - Washington …
https://www.washingtontimes.com/news/2005/may/13/20050513-122032-5055r
May 13, 2005 · U.S. Border Patrol agents have been ordered not to arrest illegal aliens along the section of the Arizona border where protesters patrolled last month because an increase in apprehensions there ...

Obama Admin. Orders Border Patrol to Stand Down ...
https://conservative-daily.com/2014/03/12/4370
Stop the Obama administration from ordering our Border Patrol agents to stand-down! Since 2007, there have been 6,000 assaults on Federal Border Patrol agents, resulting in numerous injuries and the deaths of three agents.

Breaking Obama Orders Border Patrol to Stand Down ...
https://conservative-daily.com/2016/02/05/breaking%e2%9d%97-obama...
Breaking Obama Orders Border Patrol to Stand Down. By Joe Otto / 02/05/2016 / Conservative Issues, Government Overreach, Immigration, The Constitution, Today's Action Alerts. Fellow Conservative, It always surprises me to learn just how far the Obama administration will go to damage the country.

ACLU Wants Border Patrol to Stand-Down During …
https://www.breitbart.com/border/2017/08/25/aclu-wants-border...
The ACLU (American Civil Liberties Union) asked the U.S. Border Patrol to stand-down during Hurricane Harvey. They say the agency’s refusal to close checkpoints during the storm puts illegal aliens in grave danger..

Besides, lefties should
Demanding control of the border, because people DIE trying to get in illegally.

I've seen plenty of Much Loved democrats calling for a wall. It's a great idea when Bill or Hillary or Obama says it.
Trump says it and the butthurt resistance explodes.

We Need a wall.

Why is it that the CBP is not capable of assessing its own needs?

How long have they been around?
When was the last time they actually got the job done?
What happens IF they are given All the best technology and start to achieve the goal of controlling our border while Trump is in office, but the next administration forces them to Not do their job?
We Need a wall
And we need people and technology to defend the wall.

Once America sees what Actually controlling the border does, and the stories about dead people who failed to cross the dessert safely, women raped and murdered, economic losses created by the immigrants and diseases not impacting our people, the wall will be a tool appreciated by Americans.