Cutting the engines within seconds of leaving the ground doesn't fit suicide very well. I'd expect something more like flying into the side of a mountain or heading really far out into the Indian ocean until you vanish from radar and cause a big mystery.
For instance, you might deliberately kill yourself by driving your car really fast into something solid, but you probably wouldn't try to do that while backing out of the garage.
I think it is opposite.
Flying into a mountain & etc would require one pilot to somehow incapacitate another pilot.
Cutting fuel off, if done on takeoff, is not recoverable (engines can’t relight and spin up quickly enough).
For instance, you might deliberately kill yourself by driving your car really fast into something solid, but you probably wouldn't try to do that while backing out of the garage.