Shoemaker-Levy 9 would have been an extinction level event if it hit here. Fortunately, those are less likely to hit Earth than Jupiter, as Jupiter’s size and gravity is what is capturing the comets. Jupiter creates its own problems, where the Earth does not.
Actually, it wasn’t. Small compared to a 100 kiloton bomb but not small compared to a modern nuke of about 50 KT. If it had been only about 5 miles about the earth when it went off you could send notes to the people of that area telling them that it could have been worse, they could have been killed by a bigger meteor.
It intrigues me that we knew the exact path of the 150’ meteor (2012 DA14), but never knew a thing about the 55’ meteor.