The man in the article you linked purposefully crawled under a car supported only by a scissor jack, devices that are notoriously unstable. He got what was coming to him. In the video, he demonstrates the jack isn't going to break the safety pin without extreme force exerted on the lever. Levers don't get bumped hard enough to cause the jack to fall.
Put the wrench down, sell your car, and buy some bus tickets. You've managed to create another thread that contributes nothing.
This exactly, idk why he continues to waste bandwidth with these fear-mongering posts. The chances of a jackstand failing are as likely as being struck by lightning.