That's a fairly strong allegation to make against the crews and owners of the search vessels - do you have any evidence to back up the suggestion that they were "just going through the motions"?
FWIW my own view is that the wreckage is probably "undiscoverable" by virtue of being either in a steep valley on the sea bed or (more probably) under a few dozen feet of seabed ooze. This means that if it's *ever* discovered it will be either by accident or due to the development of a massively different and more powerful searching technology. We're looking for obbjects a few dozen feet across in several gazillion square miles of ocean bed using technologies that need to be within a few tens of feet of an object to see it. Do the maths - the probability of finding it by random searching is not zero, but it is damned *close* to zero.
€0.03 supplied,
PDR