In a perfect world, lawyers (and the entire legal system) should not be necessary. And in a perfect FOSS world, everyone respects each and every provision of every license. The reality is, however, very different, and enforcement may be a necessary evil. This need does not mean we have to open the gates to be flooded by "copyleft trolls", but to establish a sound enforcement policy, in order to unleash the lawyers only for the most blatant and repeated violations