He was not in the detective business out of political belief.
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Well what do you know! An independent detective! Lew ain't no stinkin' Pinkerton, I guess! Although how non-political can a detective really be? It's not like poor people can afford to hire a detective to bust some corrupt cops or some robber baron! So the job is inherently political! Lew is only going to take the jobs of people who can pay him which means he's in the pocket of the rich and powerful. Like right now! Whether he knows it or not, he's working to bust unionizers (i.e. Anarchists).