Curator: Since ancient times, the fine arts were developed and sustained with the aid of large subsidies from the aristocracies and religious institutions that were the public sectors of their day; it is doubtful that the arts would have survived without these subsidies.
Conclusion (so)
Governments must help finance the maintenance, advancement, and enrichment of the fine arts today.
Evidence
Contemporary societies should fulfill their obligation as stewards of cultural heritage without the assistance of aristocracies or religious institutions.
Evaluate
This paragraph is pretty dense. Let's dumb it down a bit.
Back in the days of Olde Europe, there weren't legislative bodies of government. There were rich elites and the Church. They ran the show. Part of running the show was commissioning artists to create works. The Church and other rich elites would give artists food and shelter while the artists learned their trades and worked on art.
Without that help, the arts probably wouldn't have survived.
Then the author just pivots into an unsupported opinion of his own. He says, "Clearly", but it's not the typical clearly that signals a conclusion. It's just signaling an opinion the author thinks is a self-justifying truth.
Obviously, modern societies should also give artists the subsidies they need to survive. But obviously, modern societies shouldn't let rich aristocrats or the Church be the ones to give them the money.
Thus, governments need to help finance the maintenance, advancement, and enrichment of the fine arts today.
The author is assuming that the fine arts still need subsidies to survive, and the author is saying By concluding that governments will therefore have to supply the money, she's assuming that governments are the only other possible source of this money.
What about non-rich people all chipping in $20 or so? What about getting sports franchises to sponsor artists?
Goal
Let's look for a Linking idea like, , or look for a Defender answer like, .