Could it be that MH370, with the flight crew incapacitated, the passengers dying, flew an erratic track because the ADIRU was damaged and intermittently commanded turns which ultimately resulted in this aircraft flying south until it crashed in the sea due to fuel exhaustion?
Extremely unlikely for complex electronic systems to be damaged in such a way as to have such specific failures.
If I smash up a computer, what do you think the odds are that it'll (a) stop working / fail in many respects vs. (b) start doing something specific like sending an email every hour. I'm pretty sure you'd chose (a)....
Likewise having the flight systems damaged such that they change heading periodically but otherwise function perfectly, seems almost impossible.