Let us try a trivial, commonplace, and, if necessary, coarse style.

Convinced that the public is _duped_ in the matter of protection, I have desired to prove it.

But the public wishes to be shouted at.

Then let us cry out: "Midas, King Midas, has asses' ears!" An outburst of frankness often accomplishes more than the politest circumlocution.
To tell the truth, my good people, _they are robbing you_.

It is harsh, but it is true.
The words _robbery_, _to rob_, _robber_, will seem in very bad taste to many people.