Up to some point not that long ago, public opinion as we know it didn't exist, and for some time after that it didn't matter much. I'm mentioning this because the poster you are responding to is writing about Italy. Italy's entrance into WW I was deeply unpopular in the south of Italy, and not all that popular elsewhere, I gather.

I was just adding color to the statement that they didn't believe their family's objections were necessarily moral objections.

Just some other fascinating things about WW1 and Italy. Mussolini was heavily was heavily in the Italian socialist party. His family was socialist. World War 1 breaks out, he leaves/get kicked out of the party for his support of WW1. And it wasn't just Mussolini, it caused a huge fracture in the socialist party. The main party line was neutral with a heavy anti-war stance. Which I would suggest leads Mussolini to what would become Mussolini and perhaps with a lot less opposition. I would say there is probably some evidence there giving credit to the claim that today it is probably much more easier to maintain an anti-war stance than in the past.