Two cents from a (former) music teacher –
The content of the chant is not the point. The point of chanting is what it does to your brain as you’re participating. To the primal part of your brain, it absolutely doesn’t matter what the words are; it could be (especially in elementary music class) complete non-sense and still be effective at uniting and energizing a group.
What I don’t get, is why aren’t democrats chanting more? Not everything has to be a thoughtful, nuanced position statement.