Like you said, being chivalrous won't automatically guarantee a person has morals and will be faithful. BUT. Neither does being a rude slacker guy who lets his wife drag her own heavy suitcase through the airport.
Character is important, and so is chivalry. There are some "good guys" who J. didn't happen to be taught to be chivalrous by their parents, and it's not their fault, and they're good in every other way, even though they don't help lug in the groceries or open doors for people, and they J. cant' get the hang of it. But more often, a guy who does not want to go the extra mile to behave like a strong thoughtful man with a few extra gestures that TAKE EFFORT is probably not a stellar human being.
I grew up very poor. My dad was a good man, but we were humble types and I never saw "chivalry" modeled. I was raised with the, "money doesn't matter, it's what's on the inside that counts" type thing. Which is true in a lot of ways. But off I went into the big bad world, not holding it against guys if they were broke and lacked manners because I was a "nice person".
Suffice it to say, that 20 years later, after living in Los Angeles and NYC and dating into my mid 30's, I am teaching my daughters to RUN, not walk away from men who don't have chivalry. My son knows how to open doors and treat ladies well, and he's only 3.
My daughters are having the advice I never got: You do NOT want a man who is too weak and thoughtless to open a door for you or lift a bag, because over time you will see the sky is the limit on what he will NOT do for you. And you do NOT want a guy who is not willing and able to care for a family financially, it doesn't make you a gold digger to want someone to take care of you, while you are taking care of him. And to my son I say he should WANT to be the leader and care taker.
These are not things I would have thought were true 20 years ago.
My husband and I don't have a lot of money, and I've always worked and that's OK, but I've learned a lot about people over the years, and the struggles we're having right now with no health insurance while I'm home full time with the kids for my first break EVER have shown M. where I could have had some different priorites when I was younger. But that's OK. I have whipped him into modeling as much chivalry as his Texas genes can muster for the sake of the kids, and I'm trying to teach what I have learned to my kids. My blood still boils when we're home visiting his parents and his step dad is ordering before everyone in restaurants and letting M. drag heavy high chairs across the room while pregnant. But. my husband has improved a lot with much prodding.
My kids were star struck by my husband the other week when he stopped our car in the rain to jump out and help an older lady who was struggling to get into a door at the gas station. Yes, I pinched him and nudged him and pointed because he didn't notice her, but the lesson was still taught and he got to feel proud for being a good man while the kids ooh'ed and ahhh'ed about their nice dad. Chivalry matters. It's really sad that the social norms have sunk so low that it's almost extinct.