You're not as savvy as you think you are so maybe you need to cool your jets a bit and realise the one who might be missing something is you.
Seems pretty obvious to me that she doesn't "know" Vincent is right. She believes him because she has low self esteem. It's referenced that she's never had any friends or lovers, she's always been alone. Even her mum doesn't talk to her. So it's very easy for her to believe what he says, easy to believe that people don't like her for herself because nobody ever has before.
God, at least pay attention to what you're complaining about if you're going to launch into some long crappy rant.
Also yeah it's pretty obvious you aren't a neurologist. You think people don't fall in love in warzones? In life or death situations? Think again.