How we cite our quotes: All quotations are from Taxi Driver.
Quote #1
TRAVIS: All the animals come out at night - whores, skunk pussies, buggers, queens, fairies, dopers, junkies, sick, venal. Someday a real rain will come and wash all this scum off the streets. I go all over. I take people to the Bronx, Brooklyn, I take 'em to Harlem. I don't care. Don't make no difference to me. It does to some. Some won't even take spooks. Don't make no difference to me.
Travis judges the people he sees on the streets and predicts apocalyptic vengeance against them. At the same time, he accepts everyone in his cab and isn't racist (in terms of who he'll pick up) like other cab drivers. He silently condemns, and hasn't moved to making himself the instrument of judgment and vengeance.
Quote #2
PALANTINE: What is the one thing about this country that bugs you the most?
TRAVIS: Well, I don't know. I don't follow political issues that closely, sir. I don't know.
PALANTINE: Oh, but there must be something.
TRAVIS: Well. Whatever it is, you should clean up this city here, because this city here is like an open sewer you know. It's full of filth and scum. And sometimes I can hardly take it. Whatever-whoever becomes the President should just [Travis honks the horn] really clean it up. You know what I mean? Sometimes I go out and I smell it, I get headaches it's so bad, you know...They just never go away you know...It's like...I think that the President should just clean up this whole mess here. You should just flush it right down the f***in' toilet."
Palantine probably wasn't expecting this kind of rage. He has faith in the people, but here, he's encountering someone whose inarticulate anger cries out for violence more than for political reform. Palantine handles it easily though.
Quote #3
TRAVIS: You're in a hell, and you're gonna die in hell like the rest of 'em! You're like the rest of 'em!
Travis claims Betsy is "like the rest of 'em!" because she, uh, didn't want to see a porn movie with him after having just met him. It goes to show how warped Travis' mind is—he's the one who was acting creepy and weird, yet he condemns Betsy for behaving in a completely sensible way, claiming she's just another one of the people who disgust him with their heartlessness and depravity.