For me, Corbynism is not a description of a political ideology, much less a personality cult, but of a four and half year period (from June 2015 to December 2019) when socialism in the UK advanced and then receded.
Understanding the reasons for that advance, and for its demise, are important. If we cannot learn from our mistakes (and from our successes), how can we do better in the future? Neither the emergence of Corbynism nor its failure were primarily due to individuals or groups of individuals, but to structural factors that need to be understood.
Of course the roles of individuals are important, but they are only important within the context of whether they take the opportunities and dodge the pitfalls that structural factors put before them.
