Quantum mechanics were proposed by Max Planck in 1900, 1905 it was used by Albert Einstein to explain the photoelectric effect (for which he got awarded the Nobel price in 1921), and by the 1920 it was already heavily reworked and modified by the works of people like Erwin Schroedinger, Werner Heisenberg, Louis de Broglie and Max Born.
So Relativity and Quantum mechanics are quite bad examples for what you want to say. They were adapted very quickly instead.
The fact that we need a court to decide that "embedding a copyrighted YouTube video in your site is not copyright infringement." is already a failure of the system as a whole.
No, that's one of the things a court is for: Clear up legal facts if they are not explicitely stated in the law. The E.U. copyright directive and the laws in different countries don't mention embedding, and thus a court decides when the question comes up. In this case, the system works exactly as it is supposed to be.
As we travel up to modern times, we have gone from a society that has 1 working parent and 1 at home taking care of kids to both parents normally having to work just to make ends meet. This means that the majority of parents can't teach a whole lot to their kids and public schools can (there is some interesting investigation to be done on whether or not this was planned, I recommend doing some reading).
We actually never were in a society where 1 working parent ant 1 at home taking care parent were there for the children. For some time (actually only for about 20 years between the late 1940ies and the late 1960ies), this was an ideal that was propagated - nothing more. The core family of just the parents and the children is a quite new invention, for most of human history, people were living in large, multi-generational families, and whoever had the time, may it be the older brother or the grandma, the sister of the father or a farmhand, was taking care of the children. Rich people paid wet nurses to take care of the fresh born children because the wife had more important tasks at hand than being occupied with them. Ancient Greeks and Romans hat special slaves whose main task was to educate their children. Middle age aristocrats sent their children into the monastries to attend school or to close relatives to learn about the world.
The subsidaries necessary to get this project off ground include a 17 billion pound warranty by the government and a guaranteed price for the energy about 50% above the current market prices.