The production of strangelets at the LHC would require a highly improbable chain of events. One possibility is that a high-energy collision at the LHC could produce a quark-gluon plasma, a state of matter in which quarks and gluons are freely moving. In this state, it is theoretically possible that strangelets could form. However, the conditions necessary to create a quark-gluon plasma at the LHC are extremely unlikely, and even if it did occur, the probability of producing strangelets would be very low.
Furthermore, even if strangelets were produced, it is highly unlikely that they would pose any threat to Earth. Strangelets have not been shown to have any intrinsic properties that would make them harmful. They are theorized to be very small, and they are not expected to be able to trigger a chain reaction or to cause any significant damage.
Overall, the chances that a particle collider strangelets will destroy Earth are extremely small. There is no evidence to support this notion, and it is a product of speculation and misconception rather than scientific evidence.