I wonder what happened when Palestinians marched for long distances?

Also it's telling that the language is measured in terms of acceptability. It's so vague and doesn't tell anything about what should be done for the unacceptable actions.

I'd be curious in a grim sort of way how this survey would turn out if the respondents were asked what level of force is a legitimate response for such actions.

They wouldn't, because putting these sorts of questions in material terms would reveal more than they'd like. I want them to say outright if they think state murder is an acceptable response to any of these forms of protest.