Do you seriously expect the US to infuse fear, Roman style? I think the 21st Century public might recoil at the sight of heads on pikes.
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Paraphrasing the wise Machiavelli:
"It is far better the nation/state be feared, rather than loved".
Rome prospered for 13 centuries while we are a tad past 2.
Great nations behave accordingly or they are NOT!
We either wise up or we pass away.
Apparently, some think compassion and piety will make us great.
Hmm..........................