If I may, I think slogans help even if they perhaps don’t fully reflect what is meant by them. Personally, I’ve always found “Never again, another Long Night” to be really evocative.
These phrases, like place and community names, have an emotional force that is hard to explain. Take a look at the responses to a similar sort of question that I asked here. Without wanting to stray from the topic, I sometimes think the Syndicate’s weak position is partly explained by its choice not to adopt emotive names and phrases.