What are the cons of embryonic stem cell research?

ummm,  it makes the Christian fundamentalists mad.

it makes the republicans who want support from the Christian fundamentalists mad.
(Oh wait, that's what they say.  But if they didn't have the issue, then they'd lose that support.  So, they love it, but just won't say so.)

God doesn't approve of it.  (Yeah, i have a direct line.

OH, oh, i know.  it will lead to Franken children -- embryos that are designed to be twins of their rich parents.  Or, military kids, designed to join the military and be soldiers.  (that will, in fact, happen, but probably not in the US.  OR, maybe football embryos designed to grow up into 500 pound linemen.  That could happen as well.  even in the US.)

Edit:  i note that imacatholic wants you to base your argument on the fact that the catholic church doesn't approve.  last time i looked, it was not the nation's job to support the views of any particular religion.  (i presume i got a thumbs down because he's jealous of my direct line.

You are making a lot of assumptions/statements. I hope you have some hard evidence to support your theories. Otherwise, your argument will be invalid.

A major con in using embryos is that it raises an ethical issue. We are taking live human cells to research on. Many people believe that it is immoral because we are "using" another "human being."

1) It hasn't shown any promise.

2) The only consistent result they've been able to achieve is causing cancer in the recipient.

3) ASC's have been successful enough that they've removed the one supposed "advantage" of ESC's- that of becoming any tissue type. Not only have ESC's failed to live up to that expectation, but with ASC's we already have access to every tissue type we could ever want.