What does this quote mean?

If you examine the rest of the quote, it becomes clearer,

“I mean this town. They’re perfectly willing to let him do what they’re too afraid to do themselves-it might lose ‘em a nickel. They’re perfectly willing to let him wreck his health doing what they’re afraid to do, they’re-”

Aunt Alexandra is referring to the town asking Atticus to defend Tom Robinson and then making Atticus suffer for doing so.