If you have a refutation of a major opening, publish it. Not here, but in a book. Make some money for your discovery. You've discovered something valuable. Share it with the world, take credit for your discovery before someone else does, and get the credit you deserve.
Hiding a new discovery won't erase it. Someone else will find it eventually too.

The dilemma was in my own mind as I abhor hurting someone else and, from eperience, I know the blood, sweat, and tears from writing a book on the opening.
So, I concede to the general opinion...