While some of your reasoning is correct, human have conclusively demonstrated an ability to make it more than just a biological seizure to procreate. A couple can be fully capable of finding out their spouses are infertile, and still be capable of remaining in love with each other. Poetry, architecture, dance and numerous arts have all been enriched by this feeling called love that captured artists over the years. I think the presence of statues like the Venus De Milo, buildings like the Taj Mahal and the poems of Byron (all inspired in some way by the creator being in love with someone or something) have justified the stance that human love is certainly more complex than merely an animalistic mating ritual. Now, it CAN be that too, but it doesn't necessarily HAVE to be that.
And that's a really good point, I have a lot of respect for people that will stick with their partner and their vows even upon discovering they're infertile.
My problem comes from people that would rather participate in said animalistic mating ritual and pretend it's something deeper than it actually is.
I believe in unconditional love, I just don't believe many people are loving unconditionally.
It reminds me of talking to my Grandma about it, she said "Yeah boy, when your Grandfather and I got together we were just a couple of scared kids that wanted sex and didn't really know anything about each other." Mind you, back in their time, it was customary to marry before intercourse. So they rushed to marry.
My respect for them doesn't come from some fantastical, love at first site, true love, bullshit. It comes from the fact that they've worked and tried like hell on their marriage despite all the twists and turns, for themselves, for their family and for love.
I think you look at everything too much as a science. When people say they have a chemistry they don't mean their hormones caused a chemical reaction. I don't think that everything seen as a connection with other human beings is nothing more than a hormonal illusion.
This actually isn't true, I might be the most visceral person you meet on here.