A large spinning object in space has very little friction, but is affected by gravity. The sun and moon both play a role in sapping off a tiny bit of the Earth’s rotational inertia every year. Still, it will be many millennia before that braking mechanism will affect the climate in any significant way.
So, a potential “uneven melting” should have very little result. The landmasses of Earth are like the weights on an automobile tire. The Earth has found a balance between tidal forces from space and gravity. Inertia has squeezed the planet into a slightly fat sphere, flattened at the poles by the rotational forces.
Now, if the Arctic or Antarctic completely melts, the resulting water weight will be evenly distributed around the equator. However, Antarctica and Greenland are weights pulling the center of gravity a slight bit.
When that ice completely melts (or finds its way to the ocean) the water level goes up all over the planet but the ice depth in those two location is removed from the land masses which lightens their load, and at that point, that land should rise slightly.
Now, who can really say which of these never-before-observed phenomena will be the most detrimental to life on Earth? What matters is the tiny bit that mankind’s industrial activity is causing. That is the part that a) nature never had to deal with before and b)it is the only part that we can control at all.
We can not change gravity or objects in space or the heat rate of the sun or the relative activity of volcanoes. All we can do is generate more or less greenhouse gases.
So, regardless of who or what is to blame, the fact remains that modifying human industrial activity is our best (and only) option. Once you take politics out of it, it becomes an equation of how wealthy is this generation going to be versus how many generations there ever will be.
I suspect our grandchildren will be very unhappy at our current choices. Burning fossil fuels is speeding up the end of life on planet Earth.
All we can do is speed up or slow down the process by how much more fossil fuels we put into our air.