Stem Cell Research?

Why don't we support stem cell research? With all the possibilities it holds medically, how do we justify not supporting it? Some of the arguments I've heard were almost completely absurd. What if it advances so far that humans will live forever? Though I doubt that will ever happen, even if that is an incredibly long term result, don't you think curing the incurable today is worth that slight risk? Its like playing god, so its wrong. Don't we play god every time we have a baby and create a life? Don't doctors play god, saving people who would otherwise die? Its in our nature to survive. Our average life span has greatly increased over the years and it would only make sense that it would continue to do so. We have to support the things that aren't frowned upon in order to advance. Not to long ago, heart surgery did not exist. It was not even studied. Think of all the lives saved because of the risk of the doctors who oppossed the common consensus. It would be foolish to not explore every possibility in order to help the sick. Foolish and unethical.