Their target is little girls? As far as I can tell, and it certainly explains the fandom, the producers have repeatedly stated that their only target is themselves. The effort and actual, tangible care that not only the show shows, but the fans themselves show. I've seen written masterpieces that more than compete with any best-seller out there. I've seen pictures drawn with a magnificence that only true, unbridled, (pun not intended) sheer inspiration can create.
It's not really the fact that they're ponies that gets me. It's their personalities that attract my attention. It's the show's creators that attract me by proving how much they care over and over again. It's the fans themselves that show that it doesn't matter if it's adorable pastel ponies, they will take a great medium and make it the best it can be in their own way.
I'm writing a story right now. It's all about ponies in a post-apocalyptic rebuilt society, but every piece has been inspired by something that we bronies have created, and it's entirely thanks to them that I have not only improved my writing despite moving to Germany, but have let me spin an story on a scale I could never hope to achieve before.
So before you knock us for our 'senseless behavior', I'd like for you to understand what this actually means to us. It's more than ponies, and always has been. If you refuse to understand that, there's little we can do except love and tolerate you with the life lessons we've learned.