PAs have become a lot safer. The early packaged ones were the most dangerous, being valve powered with some really nasty voltages inside. One loose internal wire and anything could have several hundred volts DC on it.

With active PA speakers and small mixers with external power supplies, there is very little that can go dangerously wrong these days. Also, venue electrics have normally been improved greatly since the '60s and '70s. Still, having some form of earth-current sensing circuit breaker is always a very good idea.