Proportionality is exactly what your post is lacking
We are showing responsibility when we say it should be reported
No one would be "straight to jail", neither would the police be "kicking down doors"
If you were lucky in about a week he'd get a visit from a uniform asking him to explain what had happened.
It took 10 days for them to appear after my idiot neighbour made the written statement I referred to above & that was only 2 years ago.
Personally I view anyone who argues against reporting such behaviour as partially condoning it.