Someone who does not know how a plane works and does not have a conscious PIC shouldn't touch anything without direction from the ground unless a collision is imminent.
I assumed the (hijacking) and (emergency) labels were pretty obvious.
It seems to me that going too long without touching the controls would come with a significant risk of the plane doing something uncontrolled and undesirable, such as entering a spiral dive or simply exceeding its design speed. The converse seems to be a high probability of an inexperienced person overcontrolling and making the situation worse.
Someone who does not know how a plane works and does not have a conscious PIC shouldn't touch anything without direction from the ground unless a collision is imminent.
I assumed the (hijacking) and (emergency) labels were pretty obvious.