Corollary to the Basic Laws of Stupidity

Re: The fourth basic law from The Basic Laws of Human Stupidity

Non-stupid people always underestimate the damaging power of stupid individuals. In particular non-stupid people constantly forget that at all times and places and under any circumstances to deal and/or associate with stupid people always turns out to be a costly mistake.

The corollary:

It takes just one stupid person to undo the work of a thousand very smart people.

The ASTM-International has a subcommittee on furniture safety. The Consumers Union, the folks who bring your Consumer Reports, is working with ASTM to come up with safer designs for furniture. They're looking at standards to make furniture tip-proof and to establish a standard for shatter-proof glass in tables.
Meanwhile, there are people who will sell you an attic bedroom that has only half of a floor:

Not included: Casts, Crutches, Insurance for when your guests fall through the frikkin’ hole in the floor. Wait, that isn’t even a hole. That’s just a lack of floor. There is floor, and then the floor suddenly stops. Be reeeal careful pushing that wheeled chair back…