My mistake - I took 'precrime' to mean simply an act that does not or has not yet amounted to a criminal act, but I see it is a term of art for punishing people on the basis of what they might do. There is nothing very wrong, IMHO, in choosing who you put your trust in and with who you associate on the basis of what they have already done. The first three words of the article are "free software communities...": its not about society as a whole, or any situation where exclusion could reasonably be considered punishment.