Why is Jupiter uninhabitable?

Jupiter is uninhabitable mainly due to the fact that it only has a very small rock core, and the rest of its mass is gas. Also, the gravity on Jupiter is about 254% of earth's, which means that humans would probably be squashed flat if we were fully exposed to it. On top of all this, there is also the small matter of the ever raging storms and the cosmic radiation, which would make living on Jupiter a very difficult feat.