Traditionally, most philosophers who’ve talked a lot about ‘dialectics’, mainly Marxists and Hegelians, have seen it in an essentially positive light, as something that drives forward progress. I think it should be recognised, though, that very often, dialectical processes are conservative: they contribute profoundly to the stability of systems, and hold back progress. Of course this is, in practice, often quite obvious, but it may be helpful to put it in theoretical terms.