Fault doesn't come into it. It's a racing incident. Neither were at fault. But it was avoidable, although that doesn't imply guilt or blame (it's motor racing, not a water treatment facility).
I'd put Maldonado as 2nd driver of the day, behind Button. Vettel was good, Alonso flattered the Ferrari, but he was still being pressured by a Williams (which may prove to be btter over the season, but hard to say after this race really)... A few other brilliant drives too - Vergne, Ricciardo especially as actual/virtual rookies.
Edit: Remember that Hamilton drove into Maldonado as well at Spa. And lots of drivers (over 50% I'd say) have purposely driven into other drivers at some point...