Do you understand that, from the perspective of the person suffering an attack, there is absolutely zero difference between a good guy that breaks in without a contract, permission, or other sort approval and an actual bad guy? The act of committing a crime actively destroys trust.
Come to me with a list of potential vulnerabilities that I can detect and investigate with an open source scanner, and we can talk. Come to me after you've already broken in, and you will never be grated the trust required to work on security systems.
I think this whole scenario effectively is perjury. Once someone has been proven to lie, everything associated with that lie needs to be vetted (or simply thrown out), because you have demonstrated that this person cannot be trusted to tell the truth. Does anyone here think that perjury is moral or ethical? Is the scenario presented here really that different?