Probably depends on whether someone really has an injured/bad back chronically or if they have a weak back/core that is in serious need of strengthening.
As someone who just hurt his back while performing hack squats, I have to say that having those muscles seize and give out on me with 230+ on my back was one of the more disturbing experiences of my life.
I've dropped weights and bars before when I pushed past my strength limits, but this was working with weight that I know I can do.
I have tweaked/hurt my back before.
I have never done so while performing a squat exercise (until now).
It has raised some hesitancy in me that I hope to conquer as my back recovers.
Complication makes it easy to explain failure.