Possibly a fetish considering he dressed up too but it's also a way of hiding oneself.
There's a saying that your eyes are a window into your soul and it's true. Our eyes can show around a 3rd of all micro expressions on our faces and not being able to see someones eyes, we cannot infer what emotions they are displaying - also it's very intimidating not being able to see someones eyes, (as if rape wasn't intimidating enough!)
Also CB may have been hiding his own insecurities by wearing goggles, maybe body dysmorphia, due to his scars or his general feelings of inadequacy. It would possibly have made him feel more 'powerful' in a sense.
I realise his scars would have been exposed, but that's not how it works, you literally hide 'the self' behind goggles, sunglasses, whatever, which makes someone gain a level of security, if that makes sense.