The world very much DOES have software control. There are whole sets of countries that cannot use certain versions of SSL and other popular encryption tools because of software export controls. Yes, the governments of these places can still get access, but they can also buy weapons ect on the black market.

https://en.wikipedia.org/wiki/Export_of_cryptography

How exactly are you going to stop the spread of knowledge? Has there ever been an example of that which worked?

Attempting to control such a thing would be even more frivolous than the War on Drugs, governments ability to control things is quite limited without taking extremely draconian measures. We don't need a War on Software.

Your stance against so called "dangerous knowledge" worries me - would you encourage banning books about cryptography and software development?