Full Idea
Whatever happens in special cases, causal theories usually make it easy to be wrong about the thing we refer to.
Gist of Idea
Causal theories of reference make errors in reference easy
Source
David Lewis (Putnam's Paradox [1984], 'What Is')
Book Reference
Lewis,David: 'Papers in Metaphysics and Epistemology' [CUP 1999], p.77
A Reaction
I suppose the point of this is that there are no checks and balances to keep reference in focus, but just a requirement to keep connected to an increasingly attenuated causal chain.