You're absolutely correct (except perhaps about the Eemian period not being catastrophic - 13+ft of sea level rise would be nothing to scoff at today!), but none of these facts should rule out making changes to keep the climate in a state that works for our civilization.
We'll probably never have a "good stable state," we'll have to keep making intentional climate alterations constantly in the future - as the population increases, a "good" state will be more and more narrowly defined as well. We can't let the planet's temperature vary anymore, not due to man-made causes today or any natural ones in the future. We have to keep watching the thermostat from now on or it's going to get ugly.
Keep in mind that we're really really good at warming the climate, so we won't fall into another ice age easily.