Um, why would it be incoherent? By all observations of perfectly coherent physics, the universe itself is currently the largest it has ever been and is growing at an ever faster pace. While perhaps your opinion is that such things should not be possible, it is clearly non-sensical to say that such a thing is incoherent when it actually seems to be the basis of the entire universe.
I don't think that is the reason for it being inappropriate. In my opinion, such phrases are a result intellectual laziness, of which I am also guilty at times.
And I don't think "accelerating inequality we’re witnessing is not the natural inequality of competition and the power law, easily explained by simple arithmetic" as an axiom compares to "that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness".
As an aside, I believe the founders of the US did some great work, but let's not put their use of certain phrases on a pedestal. For example, I for one do not believe in a creator at all.