Art plays a role in everything. It was very important as a tool of the National Socialists (NAZIs) in Germany, too. So for good or ill, art will always be a tool in politics, in social movements -- (political or non-political), and in every realm of human experience.
So no, art does not keep the thread from breaking. Art merely reflects the culture and people who make the art. If they break the thread, it is will still be broken, and that brokenness is merely reflected in the art.
On the other hand, art may be the thread that binds some individuals more strongly to their sustaining values. So it is a force for preservation, but can also be a force for destruction.