To which the diversity proponents are quick to rally a mob and get the guy fired. Open and honest discussion indeed.
If you are so insecure in your ideological position that you can't even have a discussion about it without calling foul, I'd consider that the best possible sign that you actually need to have that discussion.
It's the only way to make sure that it's properly rooted and based on fact, and to legitimize it, and by proxy, the means you use to further it.
Sticking your head in the sand to avoid criticism will probably do the exact opposite, and sure as hell wont further your cause.