I do believe thinking about it that would be true. Everyone has a camera.My guess is that if you were still flying 50,000 air miles a year you would be able to still say the same thing -- that the vast majority of the public still has not actually witnessed such behavior.
Today we are bombarded with it because everyone has a camera and it gets filmed and posted and goes viral. Plus, with 24/7 news on umpteen different channels, every channel is always looking for anything flashy to throw at their viewer. In the 70s when it happened, there was no video of it and saying, "An unruly passenger hit a steward and was arrested," was nowhere near the threshold to warrant mentioning on the limited about of national news time available to the three major networks.
Having said that, I do think that the incident rate has gone up, just not as much as the increased coverage makes it seem.
Ron