The murder of Henry Nowak is a watershed moment for this country. It marks a moment when we collectively, as a nation, need to take a step back and take a long, hard look at ourselves and ask what on earth we have become. Most of you will by now be painfully familiar with the dreadful events which took place on that night in Southampton last December. An ordinary 18-year-old lad, making his way home after a night out with mates, suddenly became the victim of a sustained and brutal knife attack.