Firstly its good to know that this man will be locked away for a long long time.
But I do wonder if perhaps the Police policy of not being interested in dealing with minor crime perhaps played a part in this.
My only experience is from the Kennington area but I know of two small shops, both Asian run, that have had problems with predominantly Black British men ( and it is proper adults rather than kids or juveniles ) walking in and taking a small item such as a chocolate bar or similar and just walking off. They make no effort to hide what they are doing or show any concern and it has been made clear to both shop keepers by local Police that they will not do anything to either prevent this happening or even make an effort to aprehend.
In fact one local community PC told me, when I challanged him over this, that even if he was in the shop at the time he would be very unlikely to get involved in arresting somebody committing such an offence because it would be consider a waste of time and resources to deal with such a trivial matter.
Which makes me wonder if such a culture is allowed to get established that somehow this man, when challanged over such behaviour, felt genuinely aggrieved over it ?
Now I accept that I would be considered a right wing lunatic by many on here when it comes to crime but I do think that we have, especially in this part of South London, allowed low level crime to go unchallanged to such an extent that some people believe they almost have a right to act in such a manner and react violently when challanged.