People have way too much free time... and money. Hhmm, feed the starving....blow up shit in outer space....meh whatever.
This is my favourite bit -
"But not to worry. NASA guarantees that its experiment will not significantly change the comet's orbit nor will the smash-up put the comet or any remnants of it on a collision course with Earth."
After saying things like
The big question is: What kind of fireworks can sky-gazers expect to see from Earth?
Scientists do not know yet.
Very little is known about comets and even less is known about their primordial cores. What exactly will happen when Tempel 1 is hit on the Fourth of July is anybody's guess.