That was not his reason, as I stated in another comment. You're free to educate yourself about his thoughts on the matter, which would be much more productive than a snarky comment.
I have already. I don't believe what he said publicly. I see no reason why I would have to. He was noted to be much more cruel and unconcerned with the destructive power of the nuclear bomb than his peers and recommended the nuking of civilian targets. He spoke of the necessity to destroy the USSR on ideological grounds. The idea that a preemptive strike would be limited against a nuclearly armed country is preposterous and ridiculous, and he had already suggested nuking for population destruction instead of military use.