MH 370 update

The search for missing flight MH 370 still goes on, but theres something very odd with the search.  The experts claim to have picked up the black box 'pinger' but now seem unable to locate the aircraft even though the pinger only has a short range (so they'd have to be close just to hear it) 
Now several people claim to have discovered possible wreckage thousands of mile from the search area, which itself is a long way off course of the flight original course.  The odd part is the searchers don't want to know, and dismiss out of hand whats been found (in one case by experts with analytical equipment)
To me it feels like they don't really want to find the plane, it's hard to imagine a reason why they wouldn't, but I could see a situation where it might be better for certain governments if the plane and it's passengers vanished for ever.  The worrying bit is if it was a fault on the aircraft then theres hundreds more of the same model flying every day.... how long before it happens again?  We'll never know if the wreckage isn't found and the cause identified