Vettel is as hard nosed and nasty as anyone in F1. Maybe not as prone to make silly mistakes as Mark but just a nasty.
Some reports say he and Hamilton hit while others say the puncture was from going over the curb.
There is rarely a race where there is not some contact among the leaders, and the in entire field in the first few corners. It is rarely intentional. If someone even twitches the field is so close the domino effect almost ensures there will be contact.