Here in the USA, Trumpists are very hostile towards immigrants coming from the Mexican border to the point where they infamously proposed to build a wall. The Biden administration is better in-name only, and has kept the concentration camps at the border.
Why is there so much hatred toward these immigrants? What is the material cause of this?
This comment is correct in general. https://lemmy.ml/comment/2780243
As for why the "far-right" is "raging" about "immigration," you'd have to ask them. The far-right is a conveniently nebulous grouping of people that you can easily incorporate plain racists, any given trump supporter, anyone who doesn't agree with your views of immigration, Most Israelies, and a good part of our current Political Overlords, as well as any other straw-man you wish to construct. So I'd say that "they" are currently raging about immigration because the date is August 18th. But I fail to see what value the question has as phrased.