if they were the only two ones, you would have something to argue about. And in either case, it was no brainer: in Dravid's case, no chance of edge and in Ganguly's case, refer to 3rd umpire (of course, he'd have got it wrong too). And in Ganguly's case, the umpire trusted Ricky Ponting, who had earlier grassed the catch (very clearly) and went to claim it. Don't even need to talk about earlier ones.