Cassini is out of gas, so what better way to end the mission than to crash it into the gas giant, and bask in the glorious new data as it rolls in?
If you ask me, NASA needs to crash random things into other random things more often.
"Hey Chuck, what's that over there?"
"I don't know Bill, but I think we should crash something into it."
"I agree. Do you think we can get the plan through committee?"
"Fuck the committee. It's already taken care of."
A few days later Chuck and Bill are eating a space age lunch in a space age cafeteria.
"Say, Chuck. Do you know what happen to the ISS? We've seem to have lost all communication."
". . . Not a clue. By the way, I'm going on vacation this afternoon. Don't know when I'll be back."