In other words, eyewitnesses are more reliable than anything else... like profilers, psychologists and psychics!
No, you've taken the wrong conclusion. Even if you are right about the legal system that can't make eyewitnesses more reliable than anything else when they aren't. And it is a fact that they aren't. All it means is that juries have to make a decision based on the information available to them, and that is often eyewitness testimony. This is not the question.
The question is, if you have some physical evidence that says one thing, and an eyewitness that says something else, what do you go with? The obvious answer *should* be, the physical evidence. The conspiracist often says the eyewitness and insists the phyical evidence must be faked.
Eyewitnesses are as reliable as good circumstantial evidence which is also used to convict people.
Each case is unique and nothing should be discounted out of hand. Especially in cases like TWA800 where there may be hundreds of independent eyewitnesses (including pilots) to the exact same thing, yet the "hard science" in the case is boiled down to a CIA video that defies all physics laws known on planet earth. And where fanciful speculation about an innocent spark igniting the fuel tank is deemed to be fact.