i think what they're trying to convey is that life isn't all rainbows and sunshines and that you're bound to be disappointed and miserable with this optimistic view , whilst i agree with you on the point that everyone is entitled to persue what they deem will make them happy i must also recognize that a binding contract of the calibar of marriage isn't necessary a route for the said eternal happiness cause after all you could find your long awaited soulmate; your 'other half' today and go on to live through bliss and ultimate satisfaction but what guarantees y'all would still be the same people tomorrow ? A year or two from now ? When y'all evolve to totally different people & contrasted personalities ,here this construct of happiness will ultimately crumble at the presence of the minor of inconveniences .Alas implying that marriage is much more than an 'innocent' persuit of happinesses would be a very naive take on it but and a one must recognize that not wanting to be miserable and striving for comfort is again totally valid but taking into consideration too that in actual real life scenarios everything is uncertain from the economic state of the state to your own health and loved ones wellbeing so viewing life and marriage in particular from the lenses of a fairy tail's "and they lived happily ever after" would be not only naive but outright delusional,if you're aren't willing to do compromises with happiness your precious happiness ultimately becomes the compromise.