Because those who predict obviously don't know what they are doing.
As to your statistics about the ocean rise, that is a joke. And even if it were so, you couldn't reasonably attribute it to Greenland and the Antartic because there is simply no way of measuring that accurately. If there is, they must have been keeping it a secret because this specific calculation has not been continuouly published since 1972.
And as to your ignorant statement, "melting faster than the models predict," is completely without any historical background or logic. Thirty years ago the 'saviors of the earth' predicted that the Maldives would be under water within 30 years. But those on your side of the issue have too short of memories to remember that and it suits your crooked agenda. To a Liberal, history began an hour ago and they will even attempt to alter that if it fits their crooked agenda.
Besides, PNAS, although it sounds official, it still is a biased activist organization. The flooding and destruction in states like Nebraska, South Dakota, and Iowa are partly due to their intervention.