Mark Gold has a characteristically well-reasoned piece in The Art Newspaper as the AAMD's two-year experiment in allowing proceeds from art sales to finance “direct care” of their collections nears its close.
The anti-deaccession view is presented as a matter of ethics, and, as Gold says, "unquestionably, preserving the objects entrusted to museums’ care is ethical. But isn’t it also ethical to pay employees an equitable living wage, to support programming that contributes to social justice and to keep doors open for the benefit of the communities that museums serve in all sorts of ways beyond owning objects?
Read the whole thing.
UPDATE: Brian Frye: "The key takeaway: 'ethics' isn't just about rules, it's about values. Which ones matter & why?"