I will consent that the points that you have made are true. "emo" is indeed a music genera and most people do only know them for their stereotypes. However you strayed from the original topic at hand. You said and I quote, "Emo and Goth are tastes in fashion, not a lifestyle." but the comment and reasoning that you just displayed was very one sided, only reiterated the negative look on stereotypes, and the definition of the word "emo".
The original topic is the distinction between the groups "emo" and "goth" and weather they are a lifestyle or simply a taste in fashion. I have found two articles that expresses the differences in a non prejudice way:
1)
[link] here it is explained the difference of the two's music, views, and history.
2)
[link] scroll down to the comment by Xapphire (panda picture). Xapphire explains that both are their own ways of life. Like, Goths typically hate society because they don't/don't want to conform to society deems "normal" and prefer to group together to create their own society of sorts. Emo people on the other hand feel as though the world is to difficult and "hates" them and some (not all) cut as a way to release.
Now do recall what I said originally as well that my view was from my personal experience, as in I had friends that use to "wander in the darker side" and a couple of them did cut (they have gotten help and moved on). I also know that there will be people who agree and disagree depending on how they are and their experiences.