It’s entirely possible that non-Jews will understand more than secular Jews, because they’re not encumbered by their own guilt. But that’s not the point. This event, according to the YWN article, is not being organized to sway non-Jewish opinion anyhow, it’s meant to bring the issue to the fore for frum Yidden.
I’m sure we will see much negative media coverage, but almost any publicity turns negative, and that doesn’t automatically make it a chillul Hashem. The benefits and costs have to be weighed, as in most decisions in life.