Here's why (from NAIC, via Sullivan):
9:25 pm: From a Tehran resident today:
I cannot sleep and not write this.
Today in Haft-e Tir, there were so many members of basij that they outnumbered the demonstrators 3 or 4 to 1. They were less focused on women. This must be related to the murder of poor Neda. And this was also why whenever they got hold of a man, women would surround them and shout don’t beat him, don’t beat and they would turn and anxiously say we didn’t beat him. It was astonishing. They explained; they talked....women are playing an amazing role in the streets; both in terms of numbers and effectiveness.