This guy become muslim, somewhere along the line, someone else who is muslim must of told him this was some way to serve Islam. Hundreds of people revert to Islam each year in the UK and quietly get on with their lives. We know this has nothing to do with Islam but there are some amongst us who are filling impressionable heads with tales of violence and revenge.
Real work needs to be done with our young muslims, especially those who begin to practise the deen and see things in black and white and through emotions. Mosques and community centres, it seems to me are ideally placed to provide this guidance.
The calmess of this guy moments after the attack is chilling.