The statement “Art is an expression of progressive social consciousness and political extension” is not a common assumption in my experience. True this statement is multi- faceted , yet I believe social consciousness and politics does exist in art, as well as in the artist.
My belief is all that exists is political by being. We all have social awareness. Art and artists are political simply by being. If it is intentionally expressed in the works, it may transcend beyond art, therefore redefining itself. Some art is visionary, some before its time, and some is political, sometimes with intention, and sometimes not.