Does the Hadron Collider pose a threat to mankind/earth

Im sure that if they are smart enough to understand the complex physics, they would be smarter than the reporters/conspiracy theorists/doomsdayers who make unnecessary noise about it.

CERN and other particle colliders around the world have been splitting the atom for many years now. The concern that some people had was because of the fact that it could create minute black holes that could consume the entire planet. This is not quite possible because :

1. Even for a nuclear 'chain' reaction to occur, there should be sufficient 'fissionable' material. This experiment does not run by feeding more and more fissionable material.

2. The black holes that could be created, have a miniscule mass and lifetime (~ yoctosecond). That means that even that a minute scale, they are not stable enough to last for any significant duration.

While us non-theoretical physicists don't fully understand the theory, we should NEVER trust "scientific" conjecture from modern-age soothsayers.

no threat at all. There are much more energetic collisions every hour whne cosmic particles collide with atomic nuclei of Earth's atmosphere. This is sometimes 100000 times more energetic than everything the LHC could do. But nothing happens. So don't worry, there are many dangers on Earth, but nothing which depends on the LHC.

No (and whilst nuclear power doesn't have all that much to do with what they're doing (other than supplying some of their electricity) it also isn't anything to fear either).

The issue has been studied enough, everything they are going to do has already been observed to happen naturally, if it were any threat to us then nature would've done it already and we wouldn't even be here to run the experiments (it'll be a while before we start operating particle accelerators at energy levels higher than what is normal in nature, it won't be until then that we'll have anything to worry about).