Trapping a person in the stocks and 'pelting them with sh**' or 'firing a crossbow into their stomach' doesn't sound too far away from lobbing a concrete bollard at folk on a motorway to me."
you are punishing people for being a danger to society, if people didnt go around lobbing blocks at cars, they would not need to be put in the stocks.
that person that threw a concrete block, will not throw another one, after getting a crossbow in his tum.
violence begets violence , get away with your namby pamby rubbish its not working and hasnt worked for years