IP law in the form we see now have not been around for 500 years... The only sanity check needed is a good clinical visit for you with your shrink
China, India, and Russia all willfully and continually violate IP laws. To state they have suddenly come around and are embracing IP is blatantly false.
As far as "how often" one only has to look at electricity, flight, and phones for just a few examples of inventions happening at the same time.
The same is true for works of culture. As the world grows it becomes increasingly stupid to grant special rights to specific entities. It is clear that it is being thought of and created by thousands of people around the world already, so what makes you so f'ing special?
You say technology is not stifled by patents? One only has to look at the current trend of large corporations continuously bullying smarter and more efficient small business into partnering or selling out. I am surprised you have never heard of this, but then again I am not.
You clearly have no idea what your talking about, but that's ok. You have a lot to learn :)