That just suggests that nuclear power is inherently uneconomical! It also doesn't make sense, because there are many nations that have nuclear reactors, but don't have or want nuclear weapons - Japan, Sweden, Belgium, and Spain come to mind offhand.
Think the implications through, in a serious manner. If thorium is cheap and safe, why isn't it being used at all today? This is the question thorium advocates never ask (and will downvote you for asking, as per my example here), and it infuriates me! I don't have an answer for this question. Thorium looks good, on paper. What I do have is observation, and observed facts do not match the written theory. Science says you should question the theory.
The countries without military nuclear programmes still made use of knowledge and technology that was developed in military programmes elsewhere. As with the bomb itself, just knowing that it can work will save a lot of time.
Your list of countries doesn't look very "clean" to me.
Think the implications through, in a serious manner. If thorium is cheap and safe, why isn't it being used at all today? This is the question thorium advocates never ask (and will downvote you for asking, as per my example here), and it infuriates me! I don't have an answer for this question. Thorium looks good, on paper. What I do have is observation, and observed facts do not match the written theory. Science says you should question the theory.