Shoutout to Daredevil for having what may well be the best in-canon explanation for superhero vigilanteism:
I’d lay awake at night listening to the sirens. I liked to put stories to them. Trying to figure out what they were for, ambulance or cops, robbery or fire. I don’t know, just a stupid game. But after I lost my sight, after my abilities developed, I realized how many sirens there actually were… how much this city suffered every single night […] For years, I buried my head and turned away. Then one night; right after we quit Landman and Zack… I heard it. […] A little girl… crying in her bed, in a building down the block. Her father liked to go to her room late at night… when his wife was asleep. […] I called Child Services… like you’re supposed to. But the mom, she wouldn’t believe it. Said it wasn’t true. And the dad, he was smart. He made sure what he did, how he did it, didn’t leave a mark. The law couldn’t do anything to help that little girl. But I could.
In Matt’s argument here, we as an audience completely understand his motivations, we understand why he tackles the law in the way that he does and it’s hard to disagree with the actions he takes. It’s easy to ridicule the idea of someone dressing up in a costume and going out to beat up criminals at night, but the way it’s portrayed in this episode, with Charlie Cox’s performance to boot, is so convincing and grounded. There’s lots to love in this episode, but this speech will always be a standout to me.