Aren't humans just tools for one another?

I see no benefit as to loving someone and bonding with them to show off your "love" to society.
What is your take on this?
Would you marry a person for love, or because they're useful?
I like to think about it this way: you have a beautiful, glass axe compared to a dirty, worn but sturdy axe. The beautiful axe will definitely shatter, so you're better off with the sturdy one, as it will chop more trees.
Aren't humans just tools for one another?
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