Everton - With the reference to the Large Hadron Collider, I take it you are repeating the suggestion there is a a vanishingly small possibility that using the LHC will create a black hole that will, it is alleged, swallow up the planet?
And you are basing this assumption on what? A religious opinion, the man on the bus,something you have read by some headline seekling hack, or a scientifically researched one? Kind of shot your initial argument in the foot there if you are relying on the latter - and if it isn't scientifically researched or evidence based, then why should we give any credence at all to such an opinion?.
To apply the precautionary principle for what is, practically speaking, an impossibility, would be a huge cop- out and a staggeringly large act of scientific cowardice.