Supposed "black hole" created in lab that warned, a few years ago, that such an event could destroy the planet, but they decided to do it anyway.

A couple things going on here -

A. It might not have been a black hole but just something that looks and acts like a black hole, like a supermassive object.
B. This lab cited other dangers to the entire planet from their experiments, like the creation of exotic particles with weird effects.

Science marches on.