Nobody wants to win like that but Vettels mistake forced Hamilton to take avoiding action to avoid a collision, the only way he could have avoided a penalty would have been to give up the position as soon as he was back under control at least then we would have had a race to the end.
Vettel is under pressure within the team, there is a desire for him to deliver the results regardless of how competitive the car is and he has a young gun snipping at his tail, this when you see the real greats just soaking it up and getting the job done. Vettel is an awesomely quick driver but not sure he can handle the pressure he is currently under hence the mistakes.