"Knowledge Management" is not an oxymoron, the term is merely being read the wrong way round.
Take Safety Management. Safety is personal and context specific, and is not an object in it’s own right, and yet nobody seems to object to the term "Safety Management". Nobody calls it an oxymoron. Safety management is not about the collection and movement of items of safety, but its about attitudes and behaviours. It's about how you manage, when you want to improve safety. Its Safety-based management.
Why is Knowledge Management different? Knowledge management is not about the collection and movement tangible particles of knowledge, but it IS about attitudes and behaviours.
Knowledge Management does not mean “the Management of Knowledge”, it means “Knowledge-based Management", or "Management with attention to Knowledge".
The management of any intangible - Safety, Risk, Quality, Knowledge - requires putting in place a Management Framework where decisions are made, and actions are taken, in full cognisance of the importance and value of that intangible. Knowledge management requires means putting in place a Knowledge Management Framework where expectations are set, roles are assigned, processes and tools are available, actions are taken and behaviours are developed and sustained, to maximise the value of the know-how of the organisation.
(For those of you who prefer the term "Knowledge Sharing", this is part of knowledge management, but you also need knowledge seeking, knowledge creation, knowledge synthesis and knowledge re-use. Sharing on its own is not enough).