And now that the stage has been set in the capital, the national leadership must take immediate action to quell what look like wars of medieval vendetta rather than the political back-and-forth of a mature democracy. It is up to the CPM and the BJP to curb their excesses in Kannur. And this is not to assume any moral equivalence in this Delhi episode, where it is clear who the perpetrators of violence were — and the vandals must be brought to justice. Ideological battles cannot be decided by angry thugs.