well...they could save a lot more lives if they were eaten. imagine now how many starving children could be saved if we would just give dolphins to them to eat. those couple of cases you mention would be meaningless in comparison.
P.S why didn't you publish cases where Dolphins kill people? there are 10 times more of those.
read this. one of many cases still think they are our saviours? killer whale is actually considered as species of dolphin...hmmm. sounds like something that wouldn't rush to help you, now does it?
your argument falls face first in a brick wall.