A lot can happen in 20-40 years, and has happened in 20-40 years throughout history. Industrial Revolution, being a prime example.
We've also become far more interconnected in the last 20 years, which plays a large part - whereas before people may have kept quiet because they thought they were the odd one out they now know they aren't.
We've also become far more interconnected in the last 20 years, which plays a large part - whereas before people may have kept quiet because they thought they were the odd one out they now know they aren't.