I think the answer is yes for some composers, from Lachenmann and Nono donkeys years ago to, for example, Cynthia Zaven and Stefan Prins today. Of course many composers have no interest in politics, obvs.I've discovered, that many members here have 'politicized' modern music.
It has never been my intention to consciously "politicize" modern music, but apparently those who already have will say otherwise. It seems that a political undercurrent has been uncovered. Some members probably knew this all along.
The question arises: is the dialogue of "traditional forms of art and music vs. modern art" political by nature, since it is perceived by some as being liberal, leftist, Marxist, non-traditional, and even destructive of tradition?
Is this an attitude of those traditionalists who feel their tradition is being threatened?
Does "modernism" equate to "liberalism?"
Will we ever be able to discuss such a thing without it having political resonances, intended or not?
But where the thread is misconceived is to locate the phenomenon in recent music. For example, Beethoven, Mozart and Wagner all had political agendas, more or less liberal.
It just is a fact that some people who write music have political ideals, and this comes out in their art, and others don't. And my guess is that it's been like that for a good 200 years.