Suppose an angel visits me tonight and tells me that when I reach the age of 60, I will suddenly find great enjoyment in the music of Kenny G. The angel also tells me that by the time I am 60, Kenny G records will be in short supply, so it might be prudent to stock up on them now.
As of now, I hate Kenny G music. The thought of my future self listening to Kenny G in the future disgusts me. Would it be rational for me to avoid buying Kenny G records today, in order to sabatoge my future self's attempts to listen to Kenny G? Or would it be rational to stock up on them now, which would further the goals of my future self while undermining the goals of my current self?