Nasa Moon Bombing Mission?

There is water on the Moon as a research clearly showed and NASA said is working on a mission to crash a spacecraft into the Moon in order to make sure that there is water on our night watcher. I think the bombing mission sounds weird and NASA is bombing the moon just for fun.
Isn't bombing the moon against space law?

I think they're doing the right thing.
Tomorrow morning NASA is not going to split the Moon in half, neither it will change its orbit. NASA will crash a Centaur rocket and a smaller spacecraft called LCROSS into the moon in order to create a crater of 70 feet wide and 16 feet deep. The two spacecrafts will be crashed into the Cabeus Crater found at Moon’s south pole at a speed of 5,600 mph in order to eject about 385 tons of lunar dust and soil where the researchers hope to find water ice between the debris.