And on the talk of emo's and goths...
Well, it's just that isn't it. Ever since around the 50's (I would say) there has always been a new thing that young people/teens had something that they could rebel against their parents to. Rock n' Roll, Hippy, glam rock, metal, goth, grunge, nu-metal, emo, tattoos, piercings, hairstyles...
We don't seem to have a vibrant, colourful, weird counter culture prevalent now.
For the young, tumblr generation this is their 'counter culture'. This is their tribe to feel part of. The majority of blogs/vlogs I have seen of young trans they do love their piercings/tats/colourful hair that at one point would have marked them as alternative.