Full Idea
The categorical imperative is also an instrument of negotiation and compromise between strangers, through which they can rise out of enmity and confront each other as equals.
Gist of Idea
The categorical imperative is not just individual, but can be used for negotiations between strangers
Source
Roger Scruton (Modern Philosophy:introduction and survey [1994], 20.6)
Book Reference
Scruton,Roger: 'Modern Philosophy: introduction and survey' [Sinclair-Stevenson 1994], p.290