Nope, we just do what we do and that's that. No need for any other explanation

I think the idea is baseless. There is no reason to suspect that there is any “higher purpose,” nor that all our actions have any connections.

Humans make decisions based on a mixture of information, reason, instinct, and inference. There is no “default position.”

Choices made for any reason other than fear seem to be pretty much a luxury. We work out of fear of need. We do things to please people, mostly, though not always out of ear of displeasing them. I do many things people would consider selfless, yet I know they are not. I do them to protect things I value, out of fear they will be lost. I think it is only when we do things in spite of such fears that we can say we do for other reasons, ie thinsg one may do for a child, even though it goes against our own instincts.