FDR floated the idea of hanging thousands of regular German soldiers en-masse, neatly divided up by unit, as some sort of extravagant warning. Obviously that didn't happen, but as it was even considered I'm surprised that so many camp guards just strolled back into civilian life. Of course many of them changed their names, their uniforms, etc. and lost themselves in the flotsam, but considering that they're being dug up now, you'd think at least some of them would have been caught and "dealt with" sooner than 70 years later.
many were caught in the years after the war but yeah most got away. it just wasn’t international headline news at the time when they did catch them. it is now because of the very fact that there are any even alive.
This guy lived for decades after the war in obscurity, bringing attention to himself only when he started speaking out against the growing Holocaust denial movement.