You seem to be confusing the causes of people's preferences with their preferences. The fact that we want sugar because of evolution doesn't mean that we don't really want sugar.

That depends on your definition of "want". My point is that the causes of preferences can't really be untangled from the preferences, because they have causal influence over how you will attempt to fulfill them, and most of that influence is subconscious or completely unconscious.

IOW, I'm focusing on the link between the cause of preferences, and how you end up behaving, thereby bypassing the difficult problem of pinning down an adequate definition of "want". ;-)

Also, not everyone needs to do anything to get adequate love and attention. Some people do in fact grow up as only children in large families or otherwise unconditionally attended to.

And those people still get their values shaped by that attention, just differently. So I'm not clear on what you're getting at there.