Why don't most people on Earth know the Asteroid belt was once a planet?

The word

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conjures up thoughts of a planet blown up by the death star.

But, how many of you know that scientifically it was proven in the 1970s that the Asteroid belt was once a planet that was destroyed with nuclear weapons?

Let me explain some of the reasons why you may never have heard of this scientific fact from the 1970s.

The first reason is that the Soviet Union and the U.S. and the Free world were in the Cold War. So, anything the Soviet Union did or said was bad. (Sort of like how people in the free world view ISIS now if ISIS was a huge nation and army like Russia was then in the 1970s).

The second reason is that this did not agree with a very religious world still in the 1970s. So, this kind of information was repressed by all religions on top of this because "Russia was atheistic then like China still is." Russia is now a Christian nation once again since the Soviet Collapse around 1990.

So, what it did was to filter through the intelligentsia of Russia at the time and percolate and this eventually convinced the most educated people in Russia that Communism and totalitarianism would eventually create earth into an Asteroid belt through a world wide nuclear war. This is one of many reasons the Soviet Union eventually collapsed.

So, this is also why you haven't heard about this and that it is a scientific fact that has been proven by the Soviets (beyond a shadow of a doubt) that the Asteroid belt was once a planet blown apart by Nuclear weapons or a single nuclear blast (one or the other).

So, the question becomes "If our ancestors did this and our ancestors were some of of the survivors of this holocaust how much danger are we in now of creating the same outcome for Earth?"

And my 2nd question would be: "How many advanced civilizations have there been here on earth in between ice ages since they first came here 65 million years ago after they killed the dinosaurs with a convenient asteroid hit on planet earth?"

And my 3rd question would be: "How many other planets are our relatives living on now that used to live on the asteroid belt planet and Mars besides Earth?"