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It's good to be principled but I'd sell one or two principles down the river to be able to implement others. I believe it's called compromise.
The left must stick to their principles and never compromise, even if it means rampant inequality and people in poverty living under a Tory government forever!
Labour must remain in opposition until they are perfect! Even though however bad they might be they'll be so much better than this absolute shower!
Etc.
Any time the Tories are doing badly you can always rely on some supposed lefty to come along and attack their own side