Sure radar can pick up false targets, and pilots can misperceive. But that doesn't mean they always do, even when the situation is extraordinary. In the 1952 DC sightings you had a combination of radar, ground visual and air visual, where an F-94 pilot was vectored to a radar target, saw an object, closed on it, only to watch it suddenly depart at "phenomenal speed" far beyond the capability of his aircraft to intercept. During this sighting his aircraft was also surrounded and paced by other objects described as glowing balls of light. I've found no reason to believe that the event did not happen, and given the corroborative factors, I don't believe mere misperception explains it. I also don't see how any laws of physics are broken by this incident ... or for that matter how the existence of UFOs in general defy the laws of physics. Just because we haven't figured out how to replicate them or what they can do doesn't mean it can't be done within a scientifically valid framework. No supernatural leap of faith is required.
Lastly, our laws of physics don't explain everything and scientific instruments are also fallible. Science itself isn't perfect and there have been plenty of scientific errors and frauds to contend with. So it isn't wise to place science on so high a pedestal that it is deemed to be perfect. It's not. We still have a lot to learn, but I believe that someday, given the time, persistence and resources, we will figure out how to create technology that can match the performance of UFOs.