Democratic politicians everywhere should pay heed. When they fail to grapple with crime lawfully, with properly funded police and clean, efficient courts, they invite demagogues to do so lawlessly. As for Salvadoreans, if they re-elect Mr Bukele in February, as seems likely, he will have five more years to tear down their country’s democratic guardrails. And if one day they tire of him, they may struggle to get rid of him.