Is this justified?

He probably won’t be bullying anymore

As someone who's been bullied, if this kid really was bullying them, absolutely.

Kids know what they're doing and they enjoy it.  I wish my bullies had parents that punished them. 

This is wrong simply for the fact that there's no scrubbing it off the internet, the persons name and personal info will probably be out there for years to come, the minute your co-worker or classmate plugs your name into a google search its game over, not to mention his father just gave the kid a potential reason to be a monster with a get out of jail free card.

Ah yes, performative parenting. Where every actual important life lesson, such as why being a bully is unacceptable, needs to be a social media clip.

I will never agree with humiliation parenting and that goes double for putting that shit on the Internet. That's not so much about correcting his kid as it is about his pops using his kids behavior to earn stripes.

Better that his dad teach him this lesson and not 4 or 5 larger cousins or brothers of victims in a back alley with weapons and no self-control.

I understand taking measures to teach a lesson. I'm all for teaching a kid about consequences and really am all for punishment for bullying. This tool didn't need to post it on the internet.

Okay, I get the message. There's other ways to get the message across because I questioned the motivation after it came full circle that not only was this recorded it was then posted to social media.

Sure you might not be your father and while I'd like to hope this was coming from a place of care, this will only create a gap between father and son as time goes on. Band-Aid fix. Hopefully I'm wrong.

Assuming he's American, can't CPS deem this as child abuse of sorts and investigate?

While I understand the theory here and I do think this might have been a good punishment however the fear was enough and posting it on the internet was uncalled for, it turns teaching lessons about bullying into its own form of bullying because bullying is in large part about humiliation. I think that making your kid do something restorative, like volunteering, is a better way. Because teaching someone that something is wrong is rarely, if ever, enough to teach them important lessons, you instead teach them that something is wrong, and then show them how to do things right.