[JumpCrisscross]

Would Americans be more or less secure in that world?

On account of (a) unjust governments being more likely to abuse power than just ones, (b) unjust governments are more dangerous than unjust actors and (c) the belief that just governments are plausible, I would say "more".

If you live under an unjust government, their curtailed power is a plus. If you live under a just government, your threat profile from unjust governments is decreased. The threat from unjust actors may increase, but that is a fair trade-off per (b).

[ChoHag]

This is what the USA has forgotten, and why they are such a disappointment to the rest of us. Unjust government can be as abusive as it likes. Just government gains its strength from justice alone and its acts of abuse are its first step towards its inevitable unjustice.

Additional: Abuse is seductive. Abuse from power is absolutely seductive.