> When a province rebelled against Roman Rule and Rome would crush them, insurrection was punished particularly harshly. People would be put in groups of 10 (hence DECImate) where each group was responsible for choosing which of those 10 would die and for killing that person.

This is incorrect. Decimation was a form of military discipline, not civilian, and it was _extremely_ rare for most of Rome's history. It was usually used for mass desertion. Thousands of people were executed for individual desertion during WW1, so you could argue that it's not THAT exotic a punishment.

The Roman Empire _did_ do various nasty things to rebellious provinces (Judea is particularly notable), but again, really nothing that we haven't seen in 20th century wars, unfortunately.