Our society is full of people who aren't mature enough to handle the information properly.

There's a bunch of busybodies who have noting better to do than screw over people's present and future on account of their past.

It's not a stretch to imagine the kind of person who cares whether your grass is 3/8" longer than the HOA says it should be showing up at a PTA meeting to complain about how someone who once went bankrupt or starred in an adult film is inherently not qualified to teach kindergarten.

That's not something we want to enable so that's why making stuff readily accessible to the public isn't good. If someone wants to dig then let them but digging up someone's past should be hard enough work that you don't do it on a whim and it doesn't scale.