Not all politics is personal but it’s very hard to explain Alex Salmond’s return to the front line of Scottish politics in any other terms. He feels very wronged. Wronged by the actions of his former party and his former deputy and successor, whose behaviour towards him may or may not have been inappropriate depending on which report or inquiry you read; and wronged by the Scottish government and legal system. How to right that wrong? Take the system on. It’s what he’s done since he first became SNP leader at the age of 35, more than three decades ago.