Why should the American people allow an abortion for a woman who got pregnany and?

The liberals tend to view life on the basis of worth. A fetus isn't worth anything, so why let it become a burden on me? This is the way the evils of nazism began. Simple violations of human rights, disguised as benifiting the people, and soon they were carried down the slippery slope that is liberalism. I know many will say "But wait Alex, nazi germany was in no way liberal, it was facist." I would reply that their understandings of facism and liberalism are incorrect then. I shalnt go over the similarities further here, as I'm sure you are aware of them (for instance, the insistance on a stronger government and its interferance in our lives by removal of religion from society and taxation to employ social changes [smoking, transfatty foods and the like]). Anyway, I've diverted from the subject at hand. The point i was making is that once abortion is universally accepted as the ultimate in comfort and ease in life, then what is to stop the next steps, such as euthinasia of the elderly, the homeless, the mentally and physically handicapped, born and yet to be born, and so on and so forth until we are genetically enegering designer babies in the womb! The real threat is not really abortion in itself, but the threat of abortion becoming lax and accepted, and what that could lead to. Nature and norms as we know it are threatened if these liberal agendas are allowed to continue.