SQL injection style security problems are merely a subclass of sanitizing user inputs. Bad user inputs can cause crashes/catastrophic problems e.g. buying -1 s

SQL injection style security problems are merely a subclass of sanitizing user inputs. Bad user inputs can cause crashes/catastrophic problems e.g. buying -1 shares from a stock market system. Therefore computer science teaches to always sanitize inputs. I was taught this in high school in the 80s. "I know I built more than one perl cgi script that concatenated user-input values together without thought or concern." You have no excuse.