- because more states have them. Increasing risk proportionately (?).
- because more unstable/nefarious states have them, which are more likely to use them. This is of course somewhat debateable, but nevertheless plenty of people believe this and they're not flatearthists.
Taking an entitlement point of view just seems to be missing the point. It does however explain why these other states want them and resent the US/the West.