When I was a kid, there was a lot of discussion on electronic media channels that the run of CERN's Large Hadron Collider would lead to black holes. At that time, the president of India, APJ Abdul Kalam, said there were no chances for destruction. You can read his statements in the article Kalam allays fears of 'Dooms Day':
"It is just that the scientists in Geneva want to establish their own belief of the creation of universe as caused by the Big Bang," Kalam, a scientist, told reporters on the sidelines of a function at the Army Hospital here.
Narrating his personal experience when he visited the CERN site in Geneva recently, Kalam said it would not create any threat to the lives of the people, but would help in enhancing their living standards.
I came to know that there is a run three scheduled today. After run one has begun that time, people believe that destruction due to blackholes may happen after 10-15 years. And still, I can see some channels and users of online platforms say that there is the possibility of destruction after some fast-moving particle collision. Some of the viewers of CERN's channels also comment that there may be a possibility of destruction.
Is there any rational basis for such claims related to destruction? If yes, then what can happen in the worst case?