[zarzavat]

The problem in this instance is that the percentage is very high on one side and very low on the other, meaning there's little incentive to avoid civilian casualties. Considering that the risk faced by American civilians is approximately zero, the risk to those civilians in other countries that America is at war with should be zero likewise.

[libertyhouse]

This doesn't really answer the question though. What is a reasonable percentage that would be acceptable to most readers here? If it helps we can assume equity in terms of ability to inflict casualties on bystanders by participating combatants?