This all goes back to what Ian Malcolm said in Jurassic Park(1993), "Your scientists were so preoccupied with whether or not they could they didn't stop to think if they should". He was the voice of reason. Science can create technology, but it can't tell us how to use it appropriately.
I completely agree with the statement that just because we can create artificial life doesn't mean that we should. We are not God. We should quit trying to play God. Playing with life is dangerous. If we have a lot of mutations due to this experimentation, who is going to deal with the fall out?
Artificial life is just like nuclear energy--the science behind it is sound. Only someone with evil intent can turn artificial life into a weapon. Artificial life is one more step in the evolution of science and technology. Twenty years ago, no one could have imagined that everyone would have mobile communication devices that can find information in an instant. Imagine what will be on the edge of technology in another two decades with everything that is brand new right now. Scientific progress naturally demands that humans experiment and create artificial life.
Just because we can eat, doesn't mean we should...?
We do things because we want to and they benefit us. All throughout history we have done all we can in an attempt to benefit us both as individuals and collectively as a society - I'm sure there were a lot of cases where people thought "maybe we shouldn't do this...?", but if they didn't then we wouldn't have those benefits now.
I see no reason not to do anything if we generally want it.
And to those saying "it's playing God"... So freaking what? God played God... If God hadn't have played God, we wouldn't exist, and we are thankful of our existence, aren't we? Maybe we should learn from God's example, or just acknowledge he doesn't exist and is completely irrelevant to this discussion.