Porn-riddled society + degeneracy. Look at Kanye and his sex toy's stunt at the Grammys recently.
According to study only slightly more than 2 Million people got married in 2023, the average ages of these people were also above 30, with some reporting that marriage rates have dropped over 60% within the last 50 years (1970-2020), before that point they continued to rise (during the high-times, Post-War era) and fall (during the low-times, like during the Great Depression) with the exception of pre-WWII and WWII era having rising marriages, and post-WWII era having a ton of marriages, but this was also during an era where divorce was considered frowned upon, and by some considered even a sin.
Marriage also used to be a practical thing that you did out of necessity, but that's not say that none of these couples loved each other unconditionally, as most of the time you just have to tolerate things that you may not entirely like about your partner (habitual things, or pet peeves that tick you off), but also vice versa.
Alt-culture also permeated itself into the mainstream, alongside the mentality, attitude and set of beliefs of altfags, they'll often wear crazy dyed hair, with all different kinds of piercings, tattoos, and other body modifications that would've been shunned and frowned upon just twenty or so years ago. So now you have a bunch of self entitled, hedonistic, "my truth is better than THE truth" individuals who don't give a damn about anybody, but themselves, and themselves alone.
I also blame hippie culture since they started the "free love, love is love" trend back in the late '60s/early '70s, the men grew their hair out, the women cut their hair really short and they all dressed down, and they're the reason we don't wear suits and dresses anymore. Also, they were a bunch of pussies and didn't actually know shit about Vietnam, they're equivalent to the modern libtard, an annoying asshat who doesn't know shit about shit, but just wants to feel morally righteous and morally superior to others, because "they're on the right side of history".