I think it is a little disingenuous to compare the Asiana accident at SFO to the Southwest 737 accident at LaGuardia.
If Asian had just thumped it in on the nosewheel after a relatively normal approach I don't think we'd be having the sort of discussion we are having here.
There is a big difference between getting circa 20-30 kts below minimum speed on the approach together with a stall warning having (apparently) missed traditional approach gates compared to a mishandled flare (not saying this is good of course!).
It's not so much the actual accidents but the reasons why each of them happens.