Behind the curtain of an internet blackout, the Islamic Republic’s security forces have killed at least 180 unarmed protesters.  Natalie Kitroeff speaks to Farnaz Fassihi about Iran’s deadliest political unrest in decades and why the United States wanted that unrest — and has helped fuel it.  Guest: Farnaz Fassihi, a reporter covering Iran for The New York Times, in conversation with Natalie Kitroeff. For more information on today’s episode, visit nytimes.com/thedaily.  Background reading:How a peaceful protest over fuel prices quickly evolved into nationwide demonstrations against the Islamic Republic and its leaders, unrest which scores of people would not survive.After the United States condemned the extrajudicial killings, Iran pointed to the rebuke as evidence that the demonstrations were backed by Western enemies.