Actually its over 70% of kids in USA grow up with two parents still. 50 years ago it was 85%, but that would have been with a lot of unhappy and abusive marriages that now with no-fault divorce are able to be dissolved.
Also child sexual and physical abuse has reduced during this same time frame. "According to David Finkelhor who tracked Child Maltreatment Report (NCANDS) data from 1990 to 2010, sexual abuse had declined 62% from 1992 to 2009 and the long-term trend for physical abuse was also down by 56% since 1992." from https://en.wikipedia.org/wiki/Child_abuse
We have a lot of problems, but your understand of the issues are poor.
Twice as many children are raised by single mothers today compared to 50 years ago. Maybe that’s the more relevant statistic? (Yes there are hero stories where one could argue this doesn’t matter…)
Abusers are at their most dangerous when you try to leave them. They will be even more dangerous if you have to damage their public reputation with the ugly truth to try to escape.
No fault divorce makes it vastly easier to divorce for a lot of reasons and making it unnecessarily hard to leave can foster situations where it becomes abusive because they don't get along that well and can't just up and leave because they want to.
How I can be a good example to my child is what I’m most worried about. I’m not even convinced myself that having the highest levels of integrity is beneficial in current society, let alone when they’re of age.
Less adult time per child means a generation with far less formation.
It has to collapse before it gets better, but it will take centuries to get back to Rome levels of violence and back stabbing.