Why?
There is no need in anyone trying to "make a case" opposing the opinion of another, for to do so would require the other be honest and open minded, truly seeking input and willing to be influenced by alternative views.
You are not said person so there is not only no way to do so, there is no need to even try.
I will however offer you something to ponder upon instead.
If, and I do say "IF", as YOU state, white rightwing males have a grievance with minorities and females, I would ask you to consider that it might possibly involve their dislike of being lumped together and treated as if this one large segment of our society ALL possess one shared negative personal trait and they are the ONLY ones within our entire society to do so.
If something did bother me about this opinion piece, (which it doesn't for I accept it as an opinion), that would be it...
Thoughts?