I have a question that why people scare to show their identity if they are doing legal? Why people do not use real identity??? It makes here a more trustable market!!
Well, it's not a question of doing legal or illegal stuff, it's merely a question whether you think it's anybody's business what you're doing! That's called freedom! Also, if you're giving away your personal data, they may get stolen. People are fed up with that happening!
This hits the mark very well. If you share your identity with what you are doing then anyone can potentially trace any/most transactions that you do to your identity and potentially the transactions of people that are not you to your identity as figuring out who sent a TX is not an exact science.