The shooting of a 15-year-old boy by a classmate on his first day back at school in Kesgrave, a quiet town in Suffolk, England was a tragic new low in a nation becoming increasingly used to a shocking rate of random youth violence. Although gun crime is on the rise in the UK, the weapon of choice is usually a knife.The attack that critically injured the teenager came just a day after a 27-year-old man went on a 90-minute stabbing rampage through Birmingham, the UK’s second largest city, killing…