Well yeah if youve had a back injury it MAY not be the best idea, but foam rolling wasnt what caused your back injury.
How does the spine being a series of bones connecting have anything to do with being dangerous for foam rolling?
Again, if you end up "foam rolling your licer and kidney", your problem isnt foam rolling, its whatever muscular disease you probably have.
Plain and simple, its ignorant to say that foam rolling your lower back is dangerous.
The spine being made up of smaller bones has everything to do on why it's dangerous. The length of the bones are smaller than the diameter of a foam roller. Therefore you got a series of bones and nerves bending around the foam roller. Not that difficult to understand. And how is applying a force to your liver and kidneys not dangerous? I don't care much muscle you got around there, that **** isn't going to be enough to protect it from a constant force like that. It's unprotected.
And no, it's not because of some sort of muscular disease like you are assuming. You know you don't have to be condescending every time you post in here. We get it. You study this stuff. Step off your high horse
Youre not the only one with a background in science. This is simple physics. Period.