Suicide mission of the pilot? I treat this as unlikely, because such an impulse reaction would not result in such perfect preparation as switching the XPDR at the perfect location, skip FPL at such moment, disable all communication systems, care for nobody touches the ELT button, disable the automatic ELT, etc etc etc. If he wanted to commit suicide, just lock the door and push nose down forward will give the wished result - why care about all the bells and whistles ringing in such action?