Anyone can do that.
Jim Collins nails the problems with this in his excellent book Beyond Entrepreneurship:
Most of us have been trained to do just the opposite [of acting on good ideas rather than spending hours deliberating on all the reasons they can’t work]. We’re well schooled in criticism, having learned that the way to show how smart we are is to cite all the reasons that something is a stupid idea or doomed to failure.
We’ve noticed many new MBAs, for example, are adept at finding all the flaws in a business idea, but they’re much less practiced at coming up with ways to make the idea work.
Many times we’ve stood facing a self-satisfied person who has just done a marvelous job of demolishing a new product idea during a discussion. Then we ask, “Yes, we know it’s an imperfect idea. But then no idea is perfect. So, now how do you intend to make this idea successful in spite of its flaws?”
Some people rise brilliantly to the challenge when they realize that the goal is no longer to show how bright they are by shooting holes in ideas.
But, alas, others do not. They’ve been trained too well in the ethos of criticism, and to build a great company, they’ll have to overcome this negative training.