The Copenhagen Suborbitals are a group of "teenage hackers in a basement" who have cobbled together a midrange ballistic missile, although without any intention of using it as a weapon. The main thing preventing other teenage hackers from doing this is violence — either the police come and arrest you, or your neighbors steal your things, or your neighbors get pissed off about the amount of nitrogen oxides you're wafting over their house and coerce you to stop.