A couple of comments on the question Has there been any mission to land on a planet or moon in the Outer Solar System?Has there been any mission to land on a planet or moon in the Outer Solar System? suggesting that there is no scientific benefit to a crash on a moon, reminded me of the recent LADEE intentional crash. It seems like there may have been at least half a dozen, intentionally crashed for scientific rationale.
How many space craft have been intentionally crashed through 2014 (include pending/planned)?