Like “taxation is theft”, “snitches get stitches” may be a cute phrase but neither is strictly appropriate. Taxation is really more like extortion, and what snitches actually deserve is a degree of retribution commensurate with the damage done, in most cases a damn good thrashing (is my Englishness showing with that phrase?) but in extreme cases far worse could be justified.
And, on reflection, although giving someone a kicking may feel satisfying, financial compensation would last longer!