This 1984 interview describes why he goes "left of center" in making music especially in solo music. Its fun to look back at this because he wanted to follow up Go Insane with another solo album and warned Fleetwood Mac not to make another album for the "wrong" reasons. In some ways, was Tango made for the wrong reasons? To get Mick out of bankruptcy especially since he put his solo album on hold and morphed it into the Tango project. So I guess he got satisfaction he had his solo songs on the album. I remember in 1987 he also said Tusk elements were similar for Tango since he was doing so much of it on his own.
https://www.youtube.com/watch?v=Tj7tfeFA5Cc
On another note, I saw this interesting interview pop up where Mick and Lindsey discuss the disco phenomenon
https://www.youtube.com/watch?v=lMjl4Qs4qP0