Yes. I'm guessing that the fourteen primarily Muslim nations that the US has bombed since 1980 felt just a bit of terror.
Neither ISIS, nor the US Empire (do you mean the US is like the Roman Empire or the British Empire?) are engaged in terrorism.
Terrorism is the killing of innocent civilians for a political purpose. Perhaps the first recorded example of terrorism is in the Book of Exodus in the Bible. Yahweh (the God of the Hebrew slaves in Egypt) killed the innocent first-born sons of the Egyptians to convince Pharaoh to "let my people go." There was no collateral damage because only the first-born sons of the Egyptians were killed. Yahweh had better smart bombs than we have.
ISIS is engaged in holy war. They are killing infidels (those who do not worship the one true God). There is no collateral damage because they only kill people who are not part of ISIS. They kill other Muslims because they think they are heretics. This is no different than the Thirty Years War in Europe when Catholics killed Protestants and vice versa. Christians killed other Christians who were deemed to be heretics.
The US Empire is engaged in a war on terrorism (this is obviously nonsense because ISIS is not engaged in terrorism). If innocents are killed, then this is collateral damage because the target is not civilians it is combatants; ISIS is waging a holy war against us because we are infidels. Collateral damage always occurs in wars.