Was she a willing participant, or did he show up uninvited? Here in Pennsylvania, it wouldn't matter. Girls (and guys) under the age of 18 cannot say "Yes" to having sex with an older man. So, even if he came invited, he would not have been able to have sex with her legally, even if she was willing.
As for Daddy, well, he's probably going to get off the hook. You would be surprised at how many people sympathize with the parent in these situations. I'll bet Butterfly has seen these cases and will tell you the same thing. Most likely, they will cut a deal for maybe a fine and probation. If Daddy is working and supporting his family, it's very likely to play out that way. This is one of the reasons the court will do a pre-sentencing investigation.
One thing is for certain after looking at the dude's picture; he sure got an ass-whooping. But, you guys are right. The parents need to keep a closer eye and maybe a shorter leash on the girl.
On this topic specifically, my opinion is the law is wrong- because it gives kids the message they can do whatever they want and be held blameless.
On the subject of age in general, though, trends are going in the wrong direction. It's gone back to 'old enough for THIS but not old enough for THAT' that was the way many decades ago, but getting even worse.
Example: states passing laws where minors cannot marry under any circumstances.. yet kids as young as 10, 12, 13, are 'parenting.'
Example: individuals under age 21 cannot buy tobacco or vaping products- yet nothing is done about older people providing young teens with alcohol and illegal drugs.
I'm sure some of the older members here can relate to 'back in the day' when it was 'he's old enough to get drafted, but he's not old enough to vote!'
Also, a work project that came up today- when a 12-year-old intentionally killed a young child, he was set to be tried as an adult. Why would a 12-year-old be considered mature enough and responsible enough for this, while at the same time individuals of 16 or 17 can't marry and 19-20-year olds can't buy cigarettes because they're now considered 'children'???
Back to the OP- if I'd been the parent in that situation, my reaction would not have been pleasant, and that's an understatement. However, I'd not look at it as 'the guy was a criminal and the girl was blameless.'