So Kimi misjudging a corner or overtake and going off the track "is racing," but Massa misjudging a bit of throttle is "omg can anyone be that dumb" ?.
There is absolutely zero indication that someone like Vettel, when at the front of the race or the serious potential to be, in an excellent car, wouldn't do the same thing.
Massa has way more experience, and has proven he is fast. That is what Ferrari is interested in. He's also completely up to speed on the team, the car, the engineers, the system. Has he slipped up twice in a race so far? Yes. To be honest I'm fairly surprised he did this time at Sepang. Being that far ahead of the field, IMO best thing to do is to for both drivers is to drive just a touch under the limit. Stay far ahead, but don't try to put down qualifying laps.
That said, with this twice now you can damn well bet Felipe will reel it in just a touch and realize you can't always go as fast as you want to. He will realize this, he'll work in simulators, his engineers will coach him, and I'm sure Schumi will give him some encouragement as well. Wouldn't be a bad idea to turn up the power-side lock on the differential too! I don't expect to see it again.
FWIW, I see much more potential in Kubica than Vettel. Kubica is fast, and fairly consistent. I could see him doing good things for BMW this year. In a faster car (McLaren or Ferrari) I could see him being very competitive.
Grip is a four letter word. All opinions are my own and not those of current or previous employers.