SF principles are just spun to suit
The SDLP initially set a good example of principled politics. Its unchanged aim was Irish unity by consent, achieved through exclusively peaceful politics - by serving all people.
Sinn Fein set a bad example by supporting the long, murderous campaign as the principled right of physical force republicans. Then it ditched that "principle" and changed from coercing to charming unionists - absurdly described as a change of strategy.
However, like coercion, insincere charm won't budge northern unionists either. Long ago the late Ian Paisley rejected that approach, quoting: "Will you come into my parlour said the spider to the fly?" Sinn Fein now resembles the self-serving spider.
When a web no longer serves its purpose, the spider simply spins a different web.