And that said, ratings are a little more nuanced than you're presenting. Shows typically decline over time and a fair number of lost viewers may simply be due to that. Presenting the 28% loss as you did implies that this is all due to the flap caused by dood's comments. That's ... specious.
I don't think it is specious at all, for this context. Yes, shows do lose viewers over time, and not all of that loss will be due to the controversy. But however they lost it, they did lose it. For a popular show, typical ratings loss is more like 10%, as I understand. A drop of over a quarter is serious trouble.
The public media noise around the controversy is just smoke. What tells, in the end, is the viewership. If there were really solid backing for the star and his ideas, viewership should have been up (or at least flat), not way down, for that season premier. Some noisy people made a stink, but that did not translate into supportive results or action in the long run.
So, if we are to use that controversy as an indicator - while some noisy people may make a stink about the Google doodle, or the Coke or Cheerios ad, that noise will not correlate to action. Apparently, the risk for taking such a stand is not large*. Heck, the Superbowl Cheerios ad was the second of its kind - some people made a stink about the first. If the business found that it ultimately hurt them, do you really think they'd have so deliberately thumbed their nose at those people a second time? No!
*As Tom Lehrer satirically noted, "It takes a certain amount of courage to get up in a coffee-house or a college auditorium and come out in favor of the things that everybody else in the audience is against - like peace and justice and brotherhood and so on."