Well, the issue is that: Even though clones result in another being with the exact same genetic make-up, that's still completely unrelated to what they become later in life. Things such as memories, life decisions, and environmental factors have unbelievably larger impacts on somebody's life than what they look like when born.
A good example I'd like to think of is to imagine that, for some idiotic reason, a group of people want to clone Albert Einstein. They can try all they want, but there's no possible way that they can recreate his entire life, nor could they be sure that he would make the exact same decisions as his counterpart did once before. And so twenty years pass and, instead of ending up with their genius like they'd imagined, they end up with a champion football player. Or a plumber. Or a military officer.
But on a brighter note.
I'm excited to see what cloning can offer the the medical field.