Political organisations (such as political parties) at national scale have a mandate to defend the interests of the nation that they represent – even if they run for trans-national elections (such as the elections to the European Parliament). They reason and act at national scale, and share the powerlessness of small-scale political action – or the unaccountability of inter-governmental negotiations when attempting to build loose federations (such as the existing "Internationals").
We do not want to end up in the same powerlessness as these existing national political organisations.
The CosmoPolitical Cooperative is precisely created to overcome the weaknesses of national politics, at their root: the mismatch between the scale of political action, and that of the phenomena upon which political action is needed. This is why our organisation is pan-European from inception, and will not build national branches.
By setting up a new, pan-European structure, we start small. But we give ourselves the capacity to reach in the longer term an effectiveness much larger than that of any existing national political organisation. This is why we don’t join them.