Are you referring to The credibility of shock advocacy: Animal rights attack messages
Results indicated that PETA’s attack message against abuses at corporate pig farms was effective in eroding the credibility of the corporate food-industry raising animals for consumption. At the same time, PETA’s credibility rose overall after participants viewed the PETA attack message.
That seems to align with your argument but not with the topic. The study was focused on corporate pig farm.
The 53 participants were volunteers participating for course credit from upper division communication courses at a large public university located in an area where agribusiness interests loom large.
This is a terrible sample to base any conclusions on.
The results only give clear indication that such advocacy messages intensify already existing negative predispositions
And this indicates it is not a generally useful approach.
The study doesn’t measure how long the effect lasts; outrage is fleeting.




Curious is this was in progressive state or not. Or was it another country altogether.