From my understanding, your transportation infrastructure is world class. There is a reason the Not Just Bikes guy uses it to show transportation done right.

I think they are barking up the wrong tree doing this in the Netherlands. As far as blocking traffic to protest cars, take a page out of the CIA sabotage manual. Perhaps hand out leaflets near the entrances and drive in a legal manner that causes traffic jams around where transportation planners work. Driving under the speed limit, waiting when lights turn, etc. There is no crime committed, but it has the same effect and targets those with the power to make changes.