How To Convince Your Child That Being Bullied Isn't Their Fault

How can I convince my child that being bullied isn't their fault?

You convince them of the fact that bullying is not their fault by valuing them as an individual, first and foremost, and ensuring that their self esteem does not tolerate unfair and bad treatment. You share that with them and make that explicit. You actually tell them, not in an overwhelming and repetitive way, but you make it clear that it's not their fault. Taking it seriously is the starting point, followed, hopefully, by some constructive action.