Every human built thing (and almost every built thing is human built) can be 'unbuilt' by humans, often quickly and trivially. See door locks. The only sure wa

Every human built thing (and almost every built thing is human built) can be 'unbuilt' by humans, often quickly and trivially. See door locks. The only sure way to protect yourself is to be part of a society - something our hunter gatherer forebears quickly latched onto.