This is getting tiresome but I'll make some final comments.
Could the private sector developed the bomb, no. The amount of resources needed strained even the govt. The idea that this could have been a private initiative is absurd (to use your term).
Tell me how the private sector created the computer. Which company, what breakthroughs did they come up with to develop the first computer (ENIAC) or the first stored program computer (MANIAC).
I will concede that the majority of development since those early models has been driven by private industry but they did not initiate it.