... there is no reason to be honest just for the sake of being honest.
This sentiment could be implied by expressing a dismissive attitude towards legality.
*Illegal is just a sick bird.*¹
I'm unsure of the origin but it's been around for several decades at a minimum.
¹ Not sure if it really needs explanation but the sarcastic homonym of illegal and ill eagle provides the implied disdain towards unwavering lawfulness