“Someday, a real rain will come and wash all this scum off the streets.”The most haunting imagery in Taxi Driver — Martin Scorsese’s classic psychological drama — tends to involve firearms, whether real or imagined. Watching the movie today, it’s hard not to wonder if Scorsese knew he’d still be talkin’ to us with such clarity 50 years later. After an honorable discharge, Bickle returns to the Big Apple to moonlight as a taxi driver, if only to deal with his unexplained insomnia. In Scorsese’s America, there are few things more terrifying than a white man with a firearm and a misguided sense of virtue. Taxi Driver is available to stream on HBO Max.