Personally, I think, for United States it does make perfect sense to redirect, say, half of the military budget onto solving real homeland security issues: climate change, sustainability, ecology, pandemics. There might be enough budget there to address climate change [1].
It'd be a risk to spend less on military, but considering that the United States has nuclear weapons and allies, is it a risk really?
The real risk is politicians not getting their kickbacks from defense suppliers, sadly. The military industrial complex that Eisenhower warned us about has a death-grip on the congressional budget, even against the wishes of Pentagon leaders.
Personally, I think, for United States it does make perfect sense to redirect, say, half of the military budget onto solving real homeland security issues: climate change, sustainability, ecology, pandemics. There might be enough budget there to address climate change [1].
It'd be a risk to spend less on military, but considering that the United States has nuclear weapons and allies, is it a risk really?
[1] https://www.nature.com/articles/d41586-020-02460-9