There is a strong element of self-loathing among progressives. Of course, not all of them share this neurosis, but progressivism is built upon the fantasy of building a perfect society that will produce the perfected human, unmotivated by self-interest. When perfection is your goal and criticizing everything about America is your modus operandi, it's hard to maintain a lot of self-esteem, unless you go fully delusional into self-worship (also a problem on the left, but probably in smaller numbers).
How is this not self-loathing? It is in fact collective self-loathing expanded to a death wish. Medusa Magazine (hat tip: Gateway Pundit):
White women: it is time to do your part! Your white children reinforce the white supremacist society that benefits you. If you claim to be progressive, and yet willingly birth white children by your own choice, you are a hypocrite. White women should be encouraged to abort their white children, and to use their freed-up time and resources to assist women of color who have no other choice but to raise their children. Women of color are in need of financial and humanitarian resources. As this white supremacist society continues to imprison black fathers, women of color are forced to stand alone in their plight to raise the next generation of Americans. White women: instead of devoting your time and energy to white children who will reinforce the struggles of women of color, how about asking women of color in what ways you can assist them in their self-liberation? How about adopting children of color who have lost their parents to the destructive white supremacist society that you have enabled and encouraged?