It's not entirely irrational.
My BMW slipped off a "roll under jack" that was lifting a jack point. And a patient pulled out the drive shaft of a half ton truck on ramps, while he was under it, that then rolled off and crushed him a bit. He wasn't injured very much but it could have been bad.
So I use multiple supports. I jack up a vehicle and then put a wheel under it before I trust the jack. And I leave jack stands on the lowest point possible (where it can't go any lower, unless something breaks). And I put a chock behind a wheel as back up to the emergency brake and the vehicle being in gear.
My BMW slipped off a "roll under jack" that was lifting a jack point. And a patient pulled out the drive shaft of a half ton truck on ramps, while he was under it, that then rolled off and crushed him a bit. He wasn't injured very much but it could have been bad.
So I use multiple supports. I jack up a vehicle and then put a wheel under it before I trust the jack. And I leave jack stands on the lowest point possible (where it can't go any lower, unless something breaks). And I put a chock behind a wheel as back up to the emergency brake and the vehicle being in gear.