War and terrorism are different things.
If I am amassing political power by putting people in fear of say, the United States, I ought to depict the US as a bunch of people to be feared.
So I show the political leaders saying that they want to kill us and I get more power. I show all the repressive state tactics of the Americans on their own people, I get more power. "Look", I say "Even at their sports games, the evil Americans treat their own citizens like they are in a prison!"
Make no mistake, much of this is puppetry in the same way that the cold war, or terrorism, or the reds etc was used as a mechanism to gain political power in the US.
Extreme things like this give an assist to facilitate a foreign orchestration of political attacks on the other (in this case, the US) and help them consolidate power. It's geopolitically and intrapolitically counter-productive --- well that is unless you are trying to control people through the forced-hand of FUD and not their actual consent.
If this is still hard, think of WW2. It was justified historically because of how Germans treated the Jews. Everyone is on board with the presumed necessary large scale destruction of Europe because of the holocaust. It was the internal horrific politics of the Nazis on people they considered foreigners which justify this.
If you want your people on board to what they think is a good, justifiable moral war, depicting your enemy as horrific and anti-freedom is a great effective way to do this. This only has to be true in the minds of the people you need to persuade - not objectively true in any sense.
These tactics enfold hawkism and make a mockery of diplomacy and civility. What kind of world do you want?
One where terrorism campaigns are a smashing success for winning local support or one where they don't actually work so people stop doing them?