Well of course, if you're a concerned parent or concerned person of any kind in Norway, the first thing you do is start an organization. There are even some who start many, in the hope of cross-pollination.
What's more extreme to me is people like NRK's economy commentator Cecilie Langum Becker, who I read today went over to a lucrative job as communication chief in Aker. A corporate PR person by trade, for 8 years, she had front page space every day to push austeritarian, interest-scold propaganda that would make The Economist blush. So good of our public broadcaster to promote voices we rarely hear from in the media /s.
Actual grass roots organizations, even for unsympathetic causes like anti-pride, worry me less than the whole Orkla-Schibsted consensus.
I think you are underestimating these grass roots groups. Some of them are supported by foreign inyerests who want to undermine trust in the government.