I think you guys are over analyzing this, the MC said these things to discard the the possible link to the vigilante's motive. If the MC had said he became a police due to compassion that makes him suspiscious because he has access to confidential information. However because he said he's only doing this for a stable income then he has no motive to be a vigilante.
The reporter thinks she is going to take advantage of him, but it's the other way around. he's smart, tip off and leak info, the reporter puts it out, and the MC can act freely with those tip offs he put up himself because it is now public info.