That seems a bit overblown. I doubt that most wasn't aware that things like this is going on. Perhaps the scale and the number of people involved is a little more than most would have expected. The worst bit, for me and most of the people I debated the documentary with is how people can be so unapologetic about doing irreparable environmental damage. There's currently a another case where a company have blatantly mismanaged handling of polluted soil, in the name of profit. The fact that these people don't give a shit, and the people working of them just hit a wall if they're trying to alert local government is the most choking, not that there's corruption.
Also this type of corruption isn't seen by Danes in our day to day life, so they don't really register on our corruption perception. I still struggle to view it as corruption and not just straight up criminal activity or deliberate environmental damage.