> makes me skeptical of the quality of the minds involved

There are plenty of us who identified the problem at the heart of this movement ages ago: many interpret the movement to change the way we engage with history as filtered through their own, nuance-capable minds, in which case there are good points to be made about glorifying parts of history that we no longer agree with. But in reality, when movements hit any semblance of popularity, they need to be interpreted through the way most people approach issues: it's entirely unsurprising to me that the reaction to this mural is based on gut aesthetic reactions instead of an attempt to engage any brain cells in understanding the mural's intent.