I dislike rape, so should I hope for more rapes to be reported so I can still see if I dislike rape?
That's an awful analogy that doesn't work in any sense. You've suggested that keeping up with PETA's activities is akin to being part of the problem so presumably this would mean that anyone who reads about a rape becomes partly responsible? Either that or it's an awful metaphor that collapses instantly.
If you think PETA or The Sun are full of shit, and have been for many years, I doubt they're going to change anytime soon. By remaining a member of their mailing lists etc, the message you're giving to PETA is "I like what you're doing so want to find out as much about you as possible".....by unsubscribing, they'll then have one person less whom they think will like them.
Are you at all familiar with the concept of having an informed opinion about something? Generally the way it works is that you collect - from a wide variety of sources - as much information about a particular subject as possible, and then use that to form a opinion that may or may not change based on new data. Generally speaking, I would say that the best way to judge PETA on their actions is to actually know something about what they're doing right now, in their own words, as well as views from neutral sources otherwise, ten years from now, you could be walking around saying what a piece of shit PETA is regardless of the fact they've completely turned it around. Is your opinion worth anything then, if you're not even prepared to base it in the present?
Staying informed by remaining signed up to a newsletter does not automatically equal supporting a company. OK, so The Sun get a hit on their adverts every time I visit. So what? Those things only pay up about 10p per 1000 impressions - I don't personally care if they make 0.0001 of a pence every time I visit, it's irrelevant. I'm not a regular visitor. I check in to their front page, see the headlines and main stories, then leave. This is not supporting The Sun, this is not having a tangible affect on their earnings as they're the most popular newspaper in the country, but it allows me to go "Yep, still talking shit" and know that my opinion of them is not due a re-think.
Frankly, anyone who is not prepared to inform themselves on a subject before taking a dramatic stance on it does not have an opinion worth listening to.