[shakna]

It doesn't even need to be due to "poor" intentions, either.

For example, a lawyer who thought she was doing the right thing and protecting many people has caused endless problems, both legal and moral, and likely ended up protecting (by tainting the case against) the very people she sought to bring to justice.

[0] https://en.wikipedia.org/wiki/Nicola_Gobbo#Lawyer_X_scandal

[vkou]

Given that she became an informant after the police gave her the choice of becoming a snitch, or getting the book thrown at her, I don't think she had any illusions about whether or not she was a scumbag.