Why is healthcare overly thorough and inefficient?

Sometimes a doctor will order a test almost certain that the patient will test negative. But he'll go ahead with the test just to prove it, and there is nothing wrong with that. Remember a doctor's job is first to collect data. And if you've ever taken a biology course with lab, you will understand that the more data the better; thus the more tests the better. In healthcare it is extremely important because with insufficient data, the patient might die. American healthcare is extremely expensive because of this, but we should also be grateful for this. In other developing countries which lack healthcare systems that take the effort that we do, patients end up dying because of insufficient tests. It is better to be safe than sorry, and that is the reason healthcare is so thorough. Believe me, if doctors only tested what they thought they needed, a lot more patients will die every year because of preventable causes.