I think people should direct their attention to things that actually cause harm (And speaking as a recovered anorexic and bulimic, no, no one has ever developed an ED because of pretty girls in bikinis in adverts).
People do have their attention on other things, there's many threads active at the moment covering a wide variety of issues, it doesn't need to be either or as it's possible to concentrate on more thing at once.
I'm glad you are recovered, and while images like that may not have caused your disorder, that doesn't mean it hasn't been a cause or trigger for anyone else.
Sooooooooo how come when it comes to campaigning for rights and equality we are told we can only concentrate on one thing at once or what is deemed to be the most important thing.
And more often (not always),the person telling you what important thing you should focus on, does fuck all for that issue themselves, apart from tell others they should do stuff.
I was considering doing the race for life, in memory of my passed aunt and talking among friends , and someone told me "breast cancer has enough attention now, you should do something for prostrate cancer instead" when asked what they do to raise awareness/funds for prostate cancer, to give my friend some ideas, surprisingly, the answer was "nothing" and they didn't know any charities etc.
I think people in general, react, campaign, raise funds for things that are important to them or have personal experience of, if something is so important to someone that they feel the need to tell other people what to spend their energy on, its usually useful to be actually doing something yourself too, as like you say it's possible to focus on more that one thing, if someone had details on things they do themselves, while I'd still think it's rude, I would actually look into the issues they feel important too.