I got rid of all mine after getting disillusioned with every one of the causes they represented.
Stickers are like statues of people, or streets named after people. They don't age well. Nothing and nobody is absolutely right, all the time or in hindsight.
Theres better ways to choose stickers. Make them yourself and it's extremely unlikely you'll ever be at odds with that artist ;). Pretty art or ubiquitous fun phrases generally also don't really go bad, unless it's so tied to a specific artist that it represents them too.