I truly believed my buns were safe & got a professional in to make the so called 'fox proof' walk in enclosure. It was trebled galvanised wire with a solid roof - not sure what else i could realistically have done to protect them...I will take some photos later & you will see it really was as safe as anyone could possibly make it...I'm sorry you feel i somehow let my buns down...I will NEVER forgive myself for what has happened & have to live with this forever.
Dont blame yourself, whats done is done, and I dont think anything is achieved by beating yourself up. I know how terrible you must be feeling cos I lost 2 myself (through my own sheer stupidy) and the best we can do is learn from it . I would be interested to see pics of your enclosure, not to judge but to see what foxes can do when theyre determined and maybe we'll all step up our security.