Unlike the activist groups, corporations don't need a cadre of believers. In other words, the silent majority. This zombie-state can be achieved by information overload, especially if the information is complex and confusing. Complexity is a problem for advocacy groups, but rarely for corporations. Corporations can always get their emotive sales and 'safety' messages across via paid advertising, repeated and repeated until it becomes accepted without question.
Nothing beats money when it comes to public persuasion.
To counter this enormous advantage in being able to by media exposure, the activist groups must exaggerate and invent fact, fears and theories to create the sensationalism they need to get reported. Given the problems they face, often these actions are understandable. However, we must recognise that, at the same time, they are deliberately misleading and misinforming the public and their own followers. Their claims, plus the lure of corporate funding, brings scientists over to the side of the corporations. There are now a large number of these junkscience-doctoring organisations working for the large corporations and industrial polluters.