Even today there are millions of kids doing things right, but there always have been and always will be those who stray
You are correct but taking all the railings off certainly results in more straying who might not have.
Some kids are fine with the railings off, mine were. I was naive, anxious about being in college, worried about whether I would get a date, just young. I needed every protection there was and am glad I got it.
And the more adults turn a blind eye or even promote illicit sex, the more kids will do it. Especially kids that grow up in houses with no married mom and dad.