We just disagree what it actually *means*.
There are parts of the Bill of Rights that are open for interpretation and whose meanings can evolve with the times, such as "cruel and unusual punishment." However, there are other parts, like the 10th Amendment that are clear and concise. The Federal gub'ment has become a bloated, out-of-control, undisciplined, free-for-all behemoth mess on both foreign and domestic issues. The crux of the problem being they ignore the restrictions imposed on them by the Constitution. As far as your stem cell example goes, the Federal gub'ment has no authority to outlaw it, just like they have no authority to fund it (e.i., force the people to pay for it).
Order and simplification are the first steps toward mastery of a subject -- the actual enemy is the unknown. -- Thomas Mann