Essentially the case brought up by many is this: teach both. In my studies of the topic, I've found that there's evidence that seems to support both sides of the issue. The hard fact is, we don’t have proof of either theory, we just have data, which is always open to interpretation. We cannot observe the events that led to/created life, we just have archaeological data. What schools should teach, then, is not the conclusions, but the raw data. Teach students to analyze that data and fairly teach both theories (both the good and the bad), and let them decide which theory they think best fits. If Evolution better fits the facts, then let them make that decision. If Intelligent Design does, then leave that up to the student. The point is, when there are valid cases made for two sides of an argument, it is intellectually dishonest to only teach one side. That doesn't teach kids how to reason and use logic, it teaches them to blindly believe whatever they're taught. It's the same reason so many math classes stress proofs.
What I see is many from each side afraid of the other side being taught, but they shouldn't be. If their theory fits the facts, it should hold its own. I have to say that I see the intelligent design side faring better in this aspect, as most don't want evolution NOT taught, just their side taught as well, whereas most people on the evolution side are adamantly opposed to Intelligent Design being taught.