Inherently, they are not, but there are things to keep in mind to operate them responsibly. For example, squat stands are typically freestanding, unless you anchor them to the floor, and they can and will tip if you load heavy weights and try to re-rack the barbell too hastily. If you are lifting close to your one-rep max and you feel you won’t be able to easily rack the weight to the stand, it’s better to bail it off your back and unload it off the floor than to excruciatingly try to get it back onto the freestanding apparatus that is a squat stand. Likewise, power racks are sturdy, so you can more easily dump the barbell right back onto the J-hooks with no issue.