Good for all who are out. I don't know how effective protest marches are. I also don't know how effective signing online petitions, spending hundreds of millions on television, writing sternly-worded oped pieces for a nice salary, or writing anguished blog posts and tweets are.
Something about people gathering in public is exotic or foreign to people in this country. I think, in part, because we lack public spaces in our daily lives.
Anyway, it's one way to stand up and say "we're here." It doesn't have to change any minds. What does?