Wall construction takes a lot of water, e.g. to mix cement or wet down roads. In arid desert regions this is a concern
Once again at a port of entry and hence a wall would do little here Also in town of Douglas are local residents suggesting the narrative their community is dangerous and hence requires an additional wall is false.
Douglas is another of these interdependent communities along the border. While there are some differences of opinion, also strong concerns about a border wall separating these communities.