Does Karma exist?

I sometimes wonder, as I am fortunate to know some fantastic people, yet they seem to be beset by misfortune. There’s my mam for one: she’s the most selfless, kind-hearted person you could imagine, yet the past few years have not been kind to her. She helps other people to the detriment of herself, and rarely seems to get anything good for herself. Yesterday, some tossers broke into her little old car and nicked an ancient stereo, that was probably close to worthless. What gives people the right to think that they can just take what they want, without a thought for the consequences? It makes me sick. If Karma exists, they will get what’s coming to them…but if it does exist, then why would this kind of thing happen to someone so nice? It’s a mystery.