Full Idea
Peter Higgs says he is a fan of supersymmetry, largely because it seems to be the only route by which gravity can be brought into the scheme.
Gist of Idea
Only supersymmetry offers to incorporate gravity into the scheme
Source
New Scientist writers (Why the Universe Exists [2017], 03)
Book Reference
New Scientist writers: 'Why the Universe Exists' [John Murray 2017], p.69
A Reaction
Peter Higgs proposed the Higgs boson (now discovered). This seems a very good reason to favour supersymmetry. A grand unified theory that left out gravity doesn't seem to be unified quite grandly enough.
Related Idea
Idea 21177 String theory offers a quantum theory of gravity, by describing the graviton [New Sci.]