The phrase "alarming element" is correct and usable in written English.
It can be used to describe a component or aspect of something that causes concern or fear.
Example: "The report highlighted an alarming element in the data that suggested a significant increase in pollution levels."
Alternatives: "worrisome factor" or "disturbing aspect."
It's this depiction of a rubber-necking feeding-frenzy that is perhaps this film's most alarming element.
Perhaps the most alarming element of the article was the claim that employees of the troll factory had contacted about 100 real US-based activists to help with the organisation of protests and events.
Another alarming element in last night's programme that was given the quick brush over was the addition of Aluminium salts to Cochineal to form E120. Again a viewer with little medical knowledge would have been left with the impression that E120 was perfectly natural and safe to ingest, yet Aluminium is a known neurotoxin that has been linked to breast cancer among other things.
As a quick aside, consider one alarming element about the next generation of workers.
Independent outside monitoring of human rights (and criticism) by organizations and other elements of civil society like a strong and investigative media (the decline of which is another alarming element of contemporary American life).
One of the more alarming elements of the New Economy is the feeling that there's no connection between usefulness as a business and viability or market recognition.
One of the most perverse and alarming elements of this subculture is an animated newscast series called The Daily Capper, which covers the exploits and stories that develop inside this playground for pedophiles.
Sunni-Shia sectarianism is an alarming new element of a long-hostile relationship between Arabs and Persians.
"We consider that one of the most alarming and scary elements of this protracted war is the presence of those elements," he said, adding some had their own agenda.
The slow movement sounded like a great animal wounded or beached, out of its element, with alarming discords and sudden changes of texture left fully exposed, no attempt made to subsume everything into an evenly pulsed flow.
Pinheiro reported an "increasing and alarming presence of foreign elements, including Jihadist militants," in Syria, some joining the rebels, others operating independently.
