plane wreckage is evidence, so is satellite data, may not be as tangible as debris. but if you are willing to listen, the proof is already there. Inmarsat analyzied the Doppler effect of the 7 pings and was able to say with certainty which arc MH370 ended up. 哭也哭了,骂也骂了,accept what it is. Wreckage will be found in due time