I'm just saying that if Nero went back through the black hole, and the only thing he did in the past was to beam down to Vulcan, step on a single Vulcanian butterfly, and then immediately return to the black hole and vanish forever, then it would still be a new timeline without that butterfly, just as much as the new timeline without Vulcan.
The magnitude of the change has nothing to do with the actual mechanics of time travel or divergent timelines. The magnitude of the change simply affects our emotional reaction to it.
I think most people's objection to this movie is emotional, based on the magnitude
of the change, not that time travel caused ANY change to the past.