That should be enough of an explanation.
Just for your edification, this was a press conference held for the press. They usually aren't attended by very large crowds of supporters and onlookers.
If you want to see a crowd in front of that building, find the link in the article that goes to rally held their last year. For this news conference there wasn't a call out for gathering a crowd, but you would have been welcomed to attend if you were interested in this ongoing procedure.
Leaving aside the comment that " it appears that pretty much no one cared about the letter" (careful, even a blogger might call you on that sentence structure) do you care?
Oh, and did you find the typo in the article? Don't want to miss that, it was a fun one!
In the first line.