If significant % of the population doesn't think it's problematic it should be allowed as long as it doesn't influence lives of the other part. You can easily opt out of any stem cells based research or treatment, we can make it not state funded. Opposing that is the kind of self-righteous aggressive morality I despise.
It's the same with abortion: about half the population thinks it's ok to let a woman decide. It doesn't influence you, your family or your community if you opt out. If you still think your feelings should dictate how others then you're the problem and the reason there are so many conflicts and so much violence caused by "I want to dictate how others live and I don't accept if they disagree".