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The phrase "are fatal" is correct and usable in written English.
It can be used to describe something that causes death or has deadly consequences.
Example: "Ignoring safety protocols in this industry can lead to accidents that are fatal."
Alternatives: "can be deadly" or "may result in death."
Dictionary
are fatal
adjective
Proceeding from, or appointed by, fate or destiny.
Exact(59)
Both types are fatal.
Sophie's one-liners are fatal.
About a third of them are fatal.
What diseases are fatal without a cure?
None of these things are fatal flaws.
But over time, and collectively, they are fatal.
But maybe the lines are fatal after all.
But you learn that very few decisions are fatal.
Many of the mutations that strike new viruses are fatal.
"I'd been rich and I'd learned how the excesses of life are fatal," he said.
These volte-faces are fatal, exclaim the Tory right and Labourites alike.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com