Nice article discussing the relevance of Taxi Driver is these times of lone wolf mass shootings. There are some differences.
But there is one critical difference between Travis and real-life shooters. The film, as it molds Travis into a killer, asks us to understand, even empathize with him. His motivations are not as clear as Dylann Roof’s racism or the Pulse nightclub shooter’s homophobia. Travis doesn’t blame one particular group for the filth and depravity of Times Square in the 1970s. Corruption is everywhere. We see it through his eyes: gangs throwing trash at his cab, couples using the back seat as they would a cheap motel. When he finally decides to use his guns, it’s not to massacre innocents, but save one, a prepubescent sex worker named Iris (Jodie Foster).