why do you think the love for this show is so intense? this is something i never seen before. this not just a good cartoon that people like. the fandom is huge and a lot of people (including myself) are obssesed over it...
what makes Friendship is magic so uniqe in this matter? we don't have fans of oter cartoons being so active about it. they generally don't try to spread the love for the show but for FiM people have the urge to show it to everyone and making them love it. why do bronies like posting MLP images so much? -especially among themsleves.
The show is okay for a kid's show. People genuinely enjoy it. The community is stronger and might have streaks of irony. It's funny to know you belong somewhere because of MLP and at what length (positively) the community goes to express love for the show.
A second point is that I like to call it a student thing. The idea that bronies are a bunch of creepy old dudes who still live in their mother's basement is preposterous. the majority is between 15 and 25 years old. That's the age people get into 'weird' hobbies like watching cartoons and circus stuff.
The reason why so much fanart sprouts is a bit the irony of creating a community based on pony cartoons. The thought of a community that actively seeks to be nice to eachother (and probably others) and that want to uphold this ideal must encourage enough people to get deeper into it. heck, there's bronies who started up a charity initiative.
Why spamming images? First off, it's an exploitable meme thing. The art on the show easily allows for manipulation with graphic programs. For those with a taste for trolling, it seems to annoy people. Secondly, bronies stem from 4chan tradition mostly and they're bred on imageboard tradition, making them think it's okay to use images in posts on other sites. They don't mean ill, but i can see where the hate comes from on that.
What really concerns me on the phenomenon is how peole twist it by making ridiculous strawmans of the fandom and taking it seriously. There exits R34 as does in every other fandom. Doesn't mean bronies are into horse sex or are out rapin yo wife, rapin yo kids. I am a bit afraid that pitchfork will be raised and requests for banning the show will be made because of this bigotry.
To OP, it is not that good an idea to raise this topic over here, as it will only strengthen the hate. Let's not discuss ponies in yet another thread ever again...