Punching him seems excessive

Leave your kids at home and they can't molest any of us

You're clearly unfamiliar with Steam

Valve

Or that dad is

Blast Offk

DoD N't
RV IE
(Safely, though)

I mean, that's fine, right up until your leg is squashing someone else into a corner, or sticking to THEIR leg instead.
.
This shouldn't even be a controversy. Sit how is comfortable until it imposes on others, and then be courteous
.
Don't invade others' personal space, don't pile 50 shopping bags on the seats, don't put your feet on the seats, give the incapacitated seats first, preheat the oven to 350 degrees, cough into your elbow, don't shove people getting on/off the bus/train, thank the driver (if you feel like it)
.
In short: don't be a dick and everyone will be fine

I'm fairly certain he can be charged with a few crimes himself, depending on what transpired between them. Given his age and the nature of the situation he likely won't be, but it's still a possibility. Forced confinement and assault sound like they'd make the list.
.
On the one hand anyone who attempts to seek out a child for sex deserves to be stopped. On the other hand there have been several instances of pedophile hunters doing way more harm than good. Especially when they misidentify their target.

Some. Body. Once. Told.
Me. The. World. Is.
Gonna. Roll. Me.
I. Ain't. The.
Sharpest. Tool. In. The.
Shed.

My nose is grey
Just liek my fur
You give me pats
I give you purrs
.
Am growing still
Will hunt the mouse
Bring hoomans gifts
(They throw them out)
.
Will scratch the chair
Run room to room
Sits in box
Make time to groom
.
For now am smol
Just pounce on toes
Make tiny mews
And boop the nose
.
Play with the string
Give hand a lick
Play so hard
Get tired so quick
.
The hooman's warm
The hood is deep
I curl right up
In hood I sleep

*Skype running by in the background*