The graph you posted doesn't negate my point. Unless you are telling me 5000 nuclear warheads are insufficient to destroy the world? I am merely explaining the calculus that has already been acted upon as evidenced by the graph you posted.Your logic regards the reason of existence of MAD is so faulty and immoral it is difficult to describe.
This graph describing the reason WHY the MAD exist, and who created it :
And it is still happens these days, the Chinese arsenal growing in the front of our eyes, country after country choose the nuclear weapons and ICBMs capable to reach USA (NK / Iran and the list will grow ), the nuclear agreements restricting the size of active warheads and decrease the trigger level of Armageddon voided by the USA.