Well it's his fault obviously but I don't think he would have it otherwise.
Nadal fight until the end on court.That's his biggest strength and his weakness.A Nadal who would be pacing himself just wouldn't be Nadal.That's why it's the main trait for which Nadal is known and loved.
He gives all on court,even with the risk on breaking his body.
IMO his problem is not his playing style(well it is a problem but not that much),it is his schedule.He shouldn't be playing so many HC tournaments and he certainly shouldn't be playing 2 weeks in a row,unless it's a GS.
He played 3 tournaments this year which weren't necessary:Rotterdam,a small event after pounding his knees at the AO HC Slam,Barcelona,a 500 tourney which he won for the 5th freaking time and Madrid,on a surface he didn't like and in a tournament he didn't particularly want to enter,but did because it was in Spain.He made it to the finals in each of these 3 events,and he played another couple of matches which he shouldn't have played.If he had used these weeks to rest he would have been better off.
I was getting my hopes up when I saw him withdraw from SW19.I thought he had learned from his mistakes.Apparently not.
According to Rafa,if he will be fully healthy,this will be his schedule:
1)Montreal starting 08.08
2)Cincinatti starting 16.08
3)USOpen starting 31.08
4)Davis Cup SF starting 18.09
5)Bangkok starting 28.09
6)Beijing starting 05.10
7)Shanghai starting 12.10
8 )Paris Masters starting 08.11
9)TMC London starting 22.11
10)Davis Cup Final starting 04.12
Call me crazy but that's a lot of tournaments and most,if not all of them,will be on HC.And considering the fact that Rafa will go deep in most of them I don't think this schedule is a wise one.Perhaps I am a bit pessimistic but I don't see him staying healthy playing this much on HC,even after a long break.