Self Preservation defines evolution.
The ability to defy it defines acing the evolutionary race.
We've the ability to choose.
To choose between life and death.
To choose between pleasure and misery, at times, but these choices are driven by motives much more complex than mere survival.
Emotions defy logic and define us.
We've the ability and the drive to choose misery, the lack of which we find quite troubling.
We've the ability to self destruct.
To shoot ourselves in the foot.
To 'change' everything.
The question is to what end ?
Is it just compulsion to check our own breaking point ?
Is there a point to be proven, to others if not ourselves ?
Is there a war to be won ?
Is there a trophy to be lifted ?
Or maybe it's just to keep us 'occupied' like Leonard did.
May be we'll never know.