When a Felon's Not Engaged in His Employment

Sung by the Sargent during the Second Act of The Pirates of Penzance, he laments that the lot of a police man often is not a happy one.  Which is understandable, considering many police in story are often portrayed as either incompetent or corrupt. 

The Sargent notes that while felons, such as the Pirates of Penzance, are in fact, villains, they are not completely consumed by their need to commit crimes and is evidenced by the innocent acts of enjoyment they pursue. 

While I can understand how baritone and tenor are capable of singing this song, I feel it just doesn't have the same effect as a bass.  Especially so at the end of the chorus, where the Sargent and his men repeat 'Happy One' an additional octave lower.  Besides, there are enough tenors in the cast supplied by Fredrick and that's good enough for me.