How should I understand 虱子多了不咬，债多了不愁 ("lice much stop biting, debt much ignored")?
虱子多了不咬，债多了不愁


Have been numb by large amount of animal that bites. And have owed too much, because people cannot pay back so people don't care about it.

It means people do not worry about somethings, because it seems too hard to solve or they have give up, so they don't care about it.