I am no physicist m0p, but as for not instantly gobbling up the planet in a day... I think you could incredibly wrong, considering light cannot escape a black hole, it could consume the earth in an unimaginably short time.
Yes physicist do say there is actually no real risk, considering the types of rays they are creating from the collisions, are hitting the earth constantly.
also, my bad, you are right, they won't be doing any collisions until October, but they successfully circulated a beam today!
just something interesting lol